21725172073430 has 64 divisors (see below), whose sum is σ = 45718873804800. Its totient is φ = 7277977734144.

The previous prime is 21725172073411. The next prime is 21725172073459. The reversal of 21725172073430 is 3437027152712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3541307 + ... + 7482726.

It is an arithmetic number, because the mean of its divisors is an integer number (714357403200).

Almost surely, 2^{21725172073430} is an apocalyptic number.

21725172073430 is an abundant number, since it is smaller than the sum of its proper divisors (23993701731370).

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

21725172073430 is a wasteful number, since it uses less digits than its factorization.

21725172073430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11024693.

The product of its (nonzero) digits is 493920, while the sum is 44.

The spelling of 21725172073430 in words is "twenty-one trillion, seven hundred twenty-five billion, one hundred seventy-two million, seventy-three thousand, four hundred thirty".