21123000210 has 32 divisors (see below), whose sum is σ = 54594832320. Its totient is φ = 5199507648.

The previous prime is 21123000187. The next prime is 21123000229. The reversal of 21123000210 is 1200032112.

It is a super-2 number, since 2×21123000210² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27080380 + ... + 27081159.

It is an arithmetic number, because the mean of its divisors is an integer number (1706088510).

Almost surely, 2^21123000210 is an apocalyptic number.

21123000210 is an abundant number, since it is smaller than the sum of its proper divisors (33471832110).

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

21123000210 is a wasteful number, since it uses less digits than its factorization.

21123000210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54161562.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21123000210 its reverse (1200032112), we get a palindrome (22323032322).

The spelling of 21123000210 in words is "twenty-one billion, one hundred twenty-three million, two hundred ten", and thus it is an aban number.