21572093730 has 64 divisors (see below), whose sum is σ = 59802012288. Its totient is φ = 4921973760.

The previous prime is 21572093723. The next prime is 21572093731. The reversal of 21572093730 is 3739027512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21572093731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1917037 + ... + 1928256.

It is an arithmetic number, because the mean of its divisors is an integer number (934406442).

Almost surely, 2^21572093730 is an apocalyptic number.

21572093730 is an abundant number, since it is smaller than the sum of its proper divisors (38229918558).

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

21572093730 is a wasteful number, since it uses less digits than its factorization.

21572093730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845331.

The product of its (nonzero) digits is 79380, while the sum is 39.

The spelling of 21572093730 in words is "twenty-one billion, five hundred seventy-two million, ninety-three thousand, seven hundred thirty".