21150131456 has 36 divisors (see below), whose sum is σ = 42374726100. Its totient is φ = 10535718912.

The previous prime is 21150131449. The next prime is 21150131473. The reversal of 21150131456 is 65413105112.

It can be written as a sum of positive squares in 2 ways, for example, as 3082470400 + 18067661056 = 55520^2 + 134416^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84701 + ... + 222428.

It is an arithmetic number, because the mean of its divisors is an integer number (1177075725).

Almost surely, 2^21150131456 is an apocalyptic number.

It is an amenable number.

21150131456 is an abundant number, since it is smaller than the sum of its proper divisors (21224594644).

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

21150131456 is an equidigital number, since it uses as much as digits as its factorization.

21150131456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307414 (or 307400 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21150131456 its reverse (65413105112), we get a palindrome (86563236568).

The spelling of 21150131456 in words is "twenty-one billion, one hundred fifty million, one hundred thirty-one thousand, four hundred fifty-six".