21001622453164 has 12 divisors (see below), whose sum is σ = 37375768773000. Its totient is φ = 10322831375168.

The previous prime is 21001622453159. The next prime is 21001622453171. The reversal of 21001622453164 is 46135422610012.

It is a super-2 number, since 2×21001622453164² (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 3 ways as a sum of consecutive naturals, for example, 44494962589 + ... + 44494963060.

It is an arithmetic number, because the mean of its divisors is an integer number (3114647397750).

Almost surely, 2^{21001622453164} is an apocalyptic number.

It is an amenable number.

21001622453164 is a deficient number, since it is larger than the sum of its proper divisors (16374146319836).

21001622453164 is a wasteful number, since it uses less digits than its factorization.

21001622453164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88989925712 (or 88989925710 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 21001622453164 in words is "twenty-one trillion, one billion, six hundred twenty-two million, four hundred fifty-three thousand, one hundred sixty-four".