121310212222021 has 4 divisors (see below), whose sum is σ = 121342708934092. Its totient is φ = 121277715509952.

The previous prime is 121310212221959. The next prime is 121310212222027. The reversal of 121310212222021 is 120222212013121.

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 97710971232996 + 23599240989025 = 9884886^2 + 4857905^2 .

It is a cyclic number.

It is not a de Polignac number, because 121310212222021 - 2⁴⁵ = 86125840133189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121310212221983 and 121310212222001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310212222027) 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, 16248350436 + ... + 16248357901.

It is an arithmetic number, because the mean of its divisors is an integer number (30335677233523).

Almost surely, 2^{121310212222021} is an apocalyptic number.

It is an amenable number.

121310212222021 is a deficient number, since it is larger than the sum of its proper divisors (32496712071).

121310212222021 is an equidigital number, since it uses as much as digits as its factorization.

121310212222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32496712070.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 121310212222021 its reverse (120222212013121), we get a palindrome (241532424235142).

The spelling of 121310212222021 in words is "one hundred twenty-one trillion, three hundred ten billion, two hundred twelve million, two hundred twenty-two thousand, twenty-one".