21373530557672 has 32 divisors (see below), whose sum is σ = 40221657021000. Its totient is φ = 10647758444544.

The previous prime is 21373530557671. The next prime is 21373530557723. The reversal of 21373530557672 is 27675503537312.

It can be written as a sum of positive squares in 4 ways, for example, as 6578476041316 + 14795054516356 = 2564854^2 + 3846434^2 .

It is a super-3 number, since 3×21373530557672³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21373530557671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59282204 + ... + 59641652.

Almost surely, 2^{21373530557672} is an apocalyptic number.

It is an amenable number.

21373530557672 is a deficient number, since it is larger than the sum of its proper divisors (18848126463328).

21373530557672 is a wasteful number, since it uses less digits than its factorization.

21373530557672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386565 (or 386561 counting only the distinct ones).

The product of its (nonzero) digits is 27783000, while the sum is 56.

The spelling of 21373530557672 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred thirty million, five hundred fifty-seven thousand, six hundred seventy-two".