21123212100210 has 96 divisors (see below), whose sum is σ = 61532384052672. Its totient is φ = 4982379258240.

The previous prime is 21123212100181. The next prime is 21123212100253. The reversal of 21123212100210 is 1200121232112.

21123212100210 is a `hidden beast` number, since 2 + 11 + 232 + 1 + 210 + 0 + 210 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288295504 + ... + 288368763.

It is an arithmetic number, because the mean of its divisors is an integer number (640962333882).

Almost surely, 2^{21123212100210} is an apocalyptic number.

21123212100210 is an abundant number, since it is smaller than the sum of its proper divisors (40409171952462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123212100210 is a wasteful number, since it uses less digits than its factorization.

21123212100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576664328 (or 576664325 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21123212100210 its reverse (1200121232112), we get a palindrome (22323333332322).

The spelling of 21123212100210 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred twelve million, one hundred thousand, two hundred ten".