21372475500 has 144 divisors (see below), whose sum is σ = 67555356960. Its totient is φ = 5688144000.

The previous prime is 21372475499. The next prime is 21372475507. The reversal of 21372475500 is 557427312.

21372475500 is a `hidden beast` number, since 2 + 13 + 72 + 4 + 75 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21372475507) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2430111 + ... + 2438889.

Almost surely, 2^21372475500 is an apocalyptic number.

21372475500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21372475500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33777678480).

21372475500 is an abundant number, since it is smaller than the sum of its proper divisors (46182881460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21372475500 is a wasteful number, since it uses less digits than its factorization.

21372475500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9345 (or 9330 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The spelling of 21372475500 in words is "twenty-one billion, three hundred seventy-two million, four hundred seventy-five thousand, five hundred".