210021212120121 has 12 divisors (see below), whose sum is σ = 303365753217072. Its totient is φ = 140013319803576.

The previous prime is 210021212120117. The next prime is 210021212120171. The reversal of 210021212120121 is 121021212120012.

210021212120121 is a `hidden beast` number, since 210 + 0 + 2 + 1 + 212 + 120 + 121 = 666.

It is not a de Polignac number, because 210021212120121 - 2² = 210021212120117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021212120094 and 210021212120103.

It is not an unprimeable number, because it can be changed into a prime (210021212120171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66846531 + ... + 69917816.

It is an arithmetic number, because the mean of its divisors is an integer number (25280479434756).

Almost surely, 2^{210021212120121} is an apocalyptic number.

It is an amenable number.

210021212120121 is a deficient number, since it is larger than the sum of its proper divisors (93344541096951).

210021212120121 is a wasteful number, since it uses less digits than its factorization.

210021212120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136934980 (or 136934977 counting only the distinct ones).

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

Adding to 210021212120121 its reverse (121021212120012), we get a palindrome (331042424240133).

The spelling of 210021212120121 in words is "two hundred ten trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred twenty-one".