21000032123210 has 64 divisors (see below), whose sum is σ = 45474584371200. Its totient is φ = 6820938476352.

The previous prime is 21000032123159. The next prime is 21000032123293. The reversal of 21000032123210 is 1232123000012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97592999 + ... + 97807941.

It is an arithmetic number, because the mean of its divisors is an integer number (710540380800).

Almost surely, 2^{21000032123210} is an apocalyptic number.

21000032123210 is an abundant number, since it is smaller than the sum of its proper divisors (24474552247990).

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

21000032123210 is a wasteful number, since it uses less digits than its factorization.

21000032123210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288435.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21000032123210 its reverse (1232123000012), we get a palindrome (22232155123222).

The spelling of 21000032123210 in words is "twenty-one trillion, thirty-two million, one hundred twenty-three thousand, two hundred ten".