121000101220021 has 4 divisors (see below), whose sum is σ = 125172518503500. Its totient is φ = 116827683936544.

The previous prime is 121000101219961. The next prime is 121000101220027. The reversal of 121000101220021 is 120022101000121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59835407562225 + 61164693657796 = 7735335^2 + 7820786^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000101220021 - 2¹¹ = 121000101217973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121000101219983 and 121000101220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000101220027) 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, 2086208641696 + ... + 2086208641753.

It is an arithmetic number, because the mean of its divisors is an integer number (31293129625875).

Almost surely, 2^{121000101220021} is an apocalyptic number.

It is an amenable number.

121000101220021 is a deficient number, since it is larger than the sum of its proper divisors (4172417283479).

121000101220021 is an equidigital number, since it uses as much as digits as its factorization.

121000101220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172417283478.

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

Adding to 121000101220021 its reverse (120022101000121), we get a palindrome (241022202220142).

The spelling of 121000101220021 in words is "one hundred twenty-one trillion, one hundred one million, two hundred twenty thousand, twenty-one".