121211102202021 has 96 divisors (see below), whose sum is σ = 210233113009920. Its totient is φ = 66535309412352.

The previous prime is 121211102202013. The next prime is 121211102202053. The reversal of 121211102202021 is 120202201112121.

121211102202021 is a `hidden beast` number, since 1 + 21 + 211 + 10 + 220 + 202 + 1 = 666.

It is not a de Polignac number, because 121211102202021 - 2³ = 121211102202013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121211102201985 and 121211102202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211102202721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7167691 + ... + 17140536.

It is an arithmetic number, because the mean of its divisors is an integer number (2189928260520).

Almost surely, 2^{121211102202021} is an apocalyptic number.

It is an amenable number.

121211102202021 is a deficient number, since it is larger than the sum of its proper divisors (89022010807899).

121211102202021 is a wasteful number, since it uses less digits than its factorization.

121211102202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24308395 (or 24308392 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121211102202021 its reverse (120202201112121), we get a palindrome (241413303314142).

The spelling of 121211102202021 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred two million, two hundred two thousand, twenty-one".