21211201021110 has 32 divisors (see below), whose sum is σ = 50913601602912. Its totient is φ = 5655573699840.

The previous prime is 21211201021079. The next prime is 21211201021151. The reversal of 21211201021110 is 1112010211212.

It is a happy number.

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 21211201021110.

It is a congruent number.

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, 46429681 + ... + 46884300.

It is an arithmetic number, because the mean of its divisors is an integer number (1591050050091).

Almost surely, 2^{21211201021110} is an apocalyptic number.

21211201021110 is an abundant number, since it is smaller than the sum of its proper divisors (29702400581802).

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

21211201021110 is a wasteful number, since it uses less digits than its factorization.

21211201021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93321568.

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

Adding to 21211201021110 its reverse (1112010211212), we get a palindrome (22323211232322).

The spelling of 21211201021110 in words is "twenty-one trillion, two hundred eleven billion, two hundred one million, twenty-one thousand, one hundred ten".