21134156552 has 16 divisors (see below), whose sum is σ = 39631353900. Its totient is φ = 10565795520.

The previous prime is 21134156521. The next prime is 21134156633. The reversal of 21134156552 is 25565143112.

It can be written as a sum of positive squares in 2 ways, for example, as 19789174276 + 1344982276 = 140674^2 + 36674^2 .

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, 88427 + ... + 223802.

Almost surely, 2^21134156552 is an apocalyptic number.

It is an amenable number.

21134156552 is a deficient number, since it is larger than the sum of its proper divisors (18497197348).

21134156552 is a wasteful number, since it uses less digits than its factorization.

21134156552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320696 (or 320692 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

Adding to 21134156552 its reverse (25565143112), we get a palindrome (46699299664).

The spelling of 21134156552 in words is "twenty-one billion, one hundred thirty-four million, one hundred fifty-six thousand, five hundred fifty-two".