121010221021 has 4 divisors (see below), whose sum is σ = 121391957052. Its totient is φ = 120628484992.

The previous prime is 121010220997. The next prime is 121010221061. The reversal of 121010221021 is 120122010121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120122010121 = 19 ⋅6322211059.

It can be written as a sum of positive squares in 2 ways, for example, as 62342599225 + 58667621796 = 249685^2 + 242214^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010221021 - 2¹⁵ = 121010188253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121010220992 and 121010221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121010221061) 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, 190867540 + ... + 190868173.

It is an arithmetic number, because the mean of its divisors is an integer number (30347989263).

Almost surely, 2^121010221021 is an apocalyptic number.

It is an amenable number.

121010221021 is a deficient number, since it is larger than the sum of its proper divisors (381736031).

121010221021 is an equidigital number, since it uses as much as digits as its factorization.

121010221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381736030.

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

Adding to 121010221021 its reverse (120122010121), we get a palindrome (241132231142).

The spelling of 121010221021 in words is "one hundred twenty-one billion, ten million, two hundred twenty-one thousand, twenty-one".