21375172137164 has 48 divisors (see below), whose sum is σ = 40885441744896. Its totient is φ = 9734218502400.

The previous prime is 21375172137073. The next prime is 21375172137223. The reversal of 21375172137164 is 46173127157312.

It is a super-3 number, since 3×21375172137164³ (a number of 41 digits) contains 333 as substring.

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, 149645099 + ... + 149787869.

It is an arithmetic number, because the mean of its divisors is an integer number (851780036352).

Almost surely, 2^{21375172137164} is an apocalyptic number.

It is an amenable number.

21375172137164 is a deficient number, since it is larger than the sum of its proper divisors (19510269607732).

21375172137164 is a wasteful number, since it uses less digits than its factorization.

21375172137164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213846 (or 213844 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 50.

The spelling of 21375172137164 in words is "twenty-one trillion, three hundred seventy-five billion, one hundred seventy-two million, one hundred thirty-seven thousand, one hundred sixty-four".