21480511431688 has 32 divisors (see below), whose sum is σ = 41823481626360. Its totient is φ = 10334759915520.

The previous prime is 21480511431671. The next prime is 21480511431727. The reversal of 21480511431688 is 88613411508412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15706304281924 + 5774207149764 = 3963118^2 + 2402958^2 .

It is a super-2 number, since 2×21480511431688² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448533345 + ... + 448581232.

Almost surely, 2^{21480511431688} is an apocalyptic number.

It is an amenable number.

21480511431688 is a deficient number, since it is larger than the sum of its proper divisors (20342970194672).

21480511431688 is a wasteful number, since it uses less digits than its factorization.

21480511431688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897114697 (or 897114693 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 52.

The spelling of 21480511431688 in words is "twenty-one trillion, four hundred eighty billion, five hundred eleven million, four hundred thirty-one thousand, six hundred eighty-eight".