21211100202210 has 32 divisors (see below), whose sum is σ = 51031106628480. Its totient is φ = 5642463815808.

The previous prime is 21211100202133. The next prime is 21211100202223. The reversal of 21211100202210 is 1220200111212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21211100202210.

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, 864335742 + ... + 864360281.

It is an arithmetic number, because the mean of its divisors is an integer number (1594722082140).

Almost surely, 2^{21211100202210} is an apocalyptic number.

21211100202210 is an abundant number, since it is smaller than the sum of its proper divisors (29820006426270).

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

21211100202210 is a wasteful number, since it uses less digits than its factorization.

21211100202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728696442.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21211100202210 its reverse (1220200111212), we get a palindrome (22431300313422).

The spelling of 21211100202210 in words is "twenty-one trillion, two hundred eleven billion, one hundred million, two hundred two thousand, two hundred ten".