121210202211021 has 24 divisors (see below), whose sum is σ = 218283307879104. Its totient is φ = 62966338810560.

The previous prime is 121210202211017. The next prime is 121210202211037. The reversal of 121210202211021 is 120112202012121.

121210202211021 is a `hidden beast` number, since 1 + 21 + 210 + 202 + 211 + 0 + 21 = 666.

It is not a de Polignac number, because 121210202211021 - 2² = 121210202211017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210202210985 and 121210202211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210202211041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87453247656 + ... + 87453249041.

It is an arithmetic number, because the mean of its divisors is an integer number (9095137828296).

Almost surely, 2^{121210202211021} is an apocalyptic number.

121210202211021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121210202211021 is a deficient number, since it is larger than the sum of its proper divisors (97073105668083).

121210202211021 is a wasteful number, since it uses less digits than its factorization.

121210202211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174906496721 (or 174906496718 counting only the distinct ones).

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

Adding to 121210202211021 its reverse (120112202012121), we get a palindrome (241322404223142).

The spelling of 121210202211021 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred two million, two hundred eleven thousand, twenty-one".