210021212102121 has 48 divisors (see below), whose sum is σ = 358130219576064. Its totient is φ = 116093587416192.

The previous prime is 210021212102099. The next prime is 210021212102159. The reversal of 210021212102121 is 121201212120012.

210021212102121 is a `hidden beast` number, since 210 + 0 + 2 + 121 + 210 + 2 + 121 = 666.

It is not a de Polignac number, because 210021212102121 - 2⁹ = 210021212101609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210021212102094 and 210021212102103.

It is not an unprimeable number, because it can be changed into a prime (210021212102921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 259999021 + ... + 260805546.

It is an arithmetic number, because the mean of its divisors is an integer number (7461046241168).

Almost surely, 2^{210021212102121} is an apocalyptic number.

210021212102121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

210021212102121 is a deficient number, since it is larger than the sum of its proper divisors (148109007473943).

210021212102121 is a wasteful number, since it uses less digits than its factorization.

210021212102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520804790 (or 520804787 counting only the distinct ones).

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

Adding to 210021212102121 its reverse (121201212120012), we get a palindrome (331222424222133).

The spelling of 210021212102121 in words is "two hundred ten trillion, twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred twenty-one".