21216601435066 has 16 divisors (see below), whose sum is σ = 31875939548928. Its totient is φ = 10591299180000.

The previous prime is 21216601434989. The next prime is 21216601435091. The reversal of 21216601435066 is 66053410661212.

It is a super-2 number, since 2×21216601435066² (a number of 27 digits) contains 22 as substring.

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, 1154806 + ... + 6615646.

It is an arithmetic number, because the mean of its divisors is an integer number (1992246221808).

Almost surely, 2^{21216601435066} is an apocalyptic number.

21216601435066 is a deficient number, since it is larger than the sum of its proper divisors (10659338113862).

21216601435066 is a wasteful number, since it uses less digits than its factorization.

21216601435066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5463957.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21216601435066 in words is "twenty-one trillion, two hundred sixteen billion, six hundred one million, four hundred thirty-five thousand, sixty-six".