21222221211210 has 16 divisors (see below), whose sum is σ = 50933330906976. Its totient is φ = 5659258989648.

The previous prime is 21222221211187. The next prime is 21222221211211. The reversal of 21222221211210 is 1211212222212.

It is not an unprimeable number, because it can be changed into a prime (21222221211211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353703686824 + ... + 353703686883.

It is an arithmetic number, because the mean of its divisors is an integer number (3183333181686).

Almost surely, 2^{21222221211210} is an apocalyptic number.

21222221211210 is an abundant number, since it is smaller than the sum of its proper divisors (29711109695766).

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

21222221211210 is a wasteful number, since it uses less digits than its factorization.

21222221211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707407373717.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222221211210 its reverse (1211212222212), we get a palindrome (22433433433422).

The spelling of 21222221211210 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, two hundred ten".