21100211211210 has 32 divisors (see below), whose sum is σ = 50673115200960. Its totient is φ = 5623099845888.

The previous prime is 21100211211193. The next prime is 21100211211227. The reversal of 21100211211210 is 1211211200112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21100211211193) and next prime (21100211211227).

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 21100211211210.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226399120 + ... + 226492299.

It is an arithmetic number, because the mean of its divisors is an integer number (1583534850030).

Almost surely, 2^{21100211211210} is an apocalyptic number.

21100211211210 is an abundant number, since it is smaller than the sum of its proper divisors (29572903989750).

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

21100211211210 is a wasteful number, since it uses less digits than its factorization.

21100211211210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452892982.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21100211211210 its reverse (1211211200112), we get a palindrome (22311422411322).

The spelling of 21100211211210 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, two hundred eleven thousand, two hundred ten".