21021100122210 has 16 divisors (see below), whose sum is σ = 50450640293376. Its totient is φ = 5605626699248.

The previous prime is 21021100122131. The next prime is 21021100122283. The reversal of 21021100122210 is 1222100112012.

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 21021100122210.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350351668674 + ... + 350351668733.

It is an arithmetic number, because the mean of its divisors is an integer number (3153165018336).

Almost surely, 2^{21021100122210} is an apocalyptic number.

21021100122210 is an abundant number, since it is smaller than the sum of its proper divisors (29429540171166).

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

21021100122210 is a wasteful number, since it uses less digits than its factorization.

21021100122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700703337417.

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

Adding to 21021100122210 its reverse (1222100112012), we get a palindrome (22243200234222).

The spelling of 21021100122210 in words is "twenty-one trillion, twenty-one billion, one hundred million, one hundred twenty-two thousand, two hundred ten".