21530723037572 has 48 divisors (see below), whose sum is σ = 43143134791680. Its totient is φ = 9209950337952.

The previous prime is 21530723037559. The next prime is 21530723037599. The reversal of 21530723037572 is 27573032703512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273182723 + ... + 273261525.

It is an arithmetic number, because the mean of its divisors is an integer number (898815308160).

Almost surely, 2^{21530723037572} is an apocalyptic number.

It is an amenable number.

21530723037572 is an abundant number, since it is smaller than the sum of its proper divisors (21612411754108).

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

21530723037572 is a wasteful number, since it uses less digits than its factorization.

21530723037572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97200 (or 97198 counting only the distinct ones).

The product of its (nonzero) digits is 1852200, while the sum is 47.

The spelling of 21530723037572 in words is "twenty-one trillion, five hundred thirty billion, seven hundred twenty-three million, thirty-seven thousand, five hundred seventy-two".