21222010101210 has 64 divisors (see below), whose sum is σ = 51070199207040. Its totient is φ = 5643942485760.

The previous prime is 21222010101209. The next prime is 21222010101223. The reversal of 21222010101210 is 1210101022212.

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 21222010101210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95828469 + ... + 96049671.

It is an arithmetic number, because the mean of its divisors is an integer number (797971862610).

Almost surely, 2^{21222010101210} is an apocalyptic number.

21222010101210 is an abundant number, since it is smaller than the sum of its proper divisors (29848189105830).

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

21222010101210 is a wasteful number, since it uses less digits than its factorization.

21222010101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229823.

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

Adding to 21222010101210 its reverse (1210101022212), we get a palindrome (22432111123422).

The spelling of 21222010101210 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, one hundred one thousand, two hundred ten".