21222221012210 has 32 divisors (see below), whose sum is σ = 38240636353920. Its totient is φ = 8479858851072.

The previous prime is 21222221012183. The next prime is 21222221012257. The reversal of 21222221012210 is 1221012222212.

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, 154177037 + ... + 154314623.

It is an arithmetic number, because the mean of its divisors is an integer number (1195019886060).

Almost surely, 2^{21222221012210} is an apocalyptic number.

21222221012210 is a deficient number, since it is larger than the sum of its proper divisors (17018415341710).

21222221012210 is a wasteful number, since it uses less digits than its factorization.

21222221012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153890.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222221012210 its reverse (1221012222212), we get a palindrome (22443233234422).

The spelling of 21222221012210 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, twelve thousand, two hundred ten".