21372185104 has 10 divisors (see below), whose sum is σ = 41408608670. Its totient is φ = 10686092544.

The previous prime is 21372185099. The next prime is 21372185119. The reversal of 21372185104 is 40158127312.

It can be written as a sum of positive squares in only one way, i.e., 20672688400 + 699496704 = 143780^2 + 26448^2 .

It is a super-2 number, since 2×21372185104² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21372185104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667880769 + ... + 667880800.

It is an arithmetic number, because the mean of its divisors is an integer number (4140860867).

Almost surely, 2^21372185104 is an apocalyptic number.

It is an amenable number.

21372185104 is a deficient number, since it is larger than the sum of its proper divisors (20036423566).

21372185104 is a wasteful number, since it uses less digits than its factorization.

21372185104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335761577 (or 1335761571 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 21372185104 in words is "twenty-one billion, three hundred seventy-two million, one hundred eighty-five thousand, one hundred four".