21542271530 has 64 divisors (see below), whose sum is σ = 42421887648. Its totient is φ = 7828254720.

The previous prime is 21542271503. The next prime is 21542271563. The reversal of 21542271530 is 3517224512.

It can be written as a sum of positive squares in 16 ways, for example, as 3707470321 + 17834801209 = 60889^2 + 133547^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4942112 + ... + 4946468.

Almost surely, 2^21542271530 is an apocalyptic number.

21542271530 is a deficient number, since it is larger than the sum of its proper divisors (20879616118).

21542271530 is a wasteful number, since it uses less digits than its factorization.

21542271530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971.

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 21542271530 in words is "twenty-one billion, five hundred forty-two million, two hundred seventy-one thousand, five hundred thirty".