121001122021 has 4 divisors (see below), whose sum is σ = 130308900652. Its totient is φ = 111693343392.

The previous prime is 121001122019. The next prime is 121001122049. The reversal of 121001122021 is 120221100121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120221100121 = 677 ⋅177579173.

It can be written as a sum of positive squares in 2 ways, for example, as 49048960900 + 71952161121 = 221470^2 + 268239^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001122021 - 2¹ = 121001122019 is a prime.

It is a super-2 number, since 2×121001122021² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 9307778617 = 121001122021 / (1 + 2 + 1 + 0 + 0 + 1 + 1 + 2 + 2 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121001121992 and 121001122010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001122051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4653889296 + ... + 4653889321.

It is an arithmetic number, because the mean of its divisors is an integer number (32577225163).

Almost surely, 2^121001122021 is an apocalyptic number.

It is an amenable number.

121001122021 is a deficient number, since it is larger than the sum of its proper divisors (9307778631).

121001122021 is an equidigital number, since it uses as much as digits as its factorization.

121001122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9307778630.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121001122021 its reverse (120221100121), we get a palindrome (241222222142).

The spelling of 121001122021 in words is "one hundred twenty-one billion, one million, one hundred twenty-two thousand, twenty-one".