21216222161356 has 24 divisors (see below), whose sum is σ = 37182209775984. Its totient is φ = 10592734353600.

The previous prime is 21216222161341. The next prime is 21216222161429. The reversal of 21216222161356 is 65316122261212.

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, 231236466 + ... + 231328198.

It is an arithmetic number, because the mean of its divisors is an integer number (1549258740666).

Almost surely, 2^{21216222161356} is an apocalyptic number.

It is an amenable number.

21216222161356 is a deficient number, since it is larger than the sum of its proper divisors (15965987614628).

21216222161356 is a wasteful number, since it uses less digits than its factorization.

21216222161356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174921 (or 174919 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The spelling of 21216222161356 in words is "twenty-one trillion, two hundred sixteen billion, two hundred twenty-two million, one hundred sixty-one thousand, three hundred fifty-six".