21100012210 has 32 divisors (see below), whose sum is σ = 38858227200. Its totient is φ = 8245497792.

The previous prime is 21100012189. The next prime is 21100012249. The reversal of 21100012210 is 1221000112.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 221491 + ... + 302089.

It is an arithmetic number, because the mean of its divisors is an integer number (1214319600).

Almost surely, 2^21100012210 is an apocalyptic number.

21100012210 is a deficient number, since it is larger than the sum of its proper divisors (17758214990).

21100012210 is a wasteful number, since it uses less digits than its factorization.

21100012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81210.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100012210 its reverse (1221000112), we get a palindrome (22321012322).

The spelling of 21100012210 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred ten".