21723052432 has 10 divisors (see below), whose sum is σ = 42088414118. Its totient is φ = 10861526208.

The previous prime is 21723052349. The next prime is 21723052433. The reversal of 21723052432 is 23425032712.

It can be written as a sum of positive squares in only one way, i.e., 14074500496 + 7648551936 = 118636^2 + 87456^2 .

It is a super-2 number, since 2×21723052432² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21723052394 and 21723052403.

It is not an unprimeable number, because it can be changed into a prime (21723052433) by changing a digit.

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 as a sum of consecutive naturals, namely, 678845373 + ... + 678845404.

Almost surely, 2^21723052432 is an apocalyptic number.

It is an amenable number.

21723052432 is a deficient number, since it is larger than the sum of its proper divisors (20365361686).

21723052432 is a wasteful number, since it uses less digits than its factorization.

21723052432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357690785 (or 1357690779 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 31.

The spelling of 21723052432 in words is "twenty-one billion, seven hundred twenty-three million, fifty-two thousand, four hundred thirty-two".