21153027204 has 30 divisors (see below), whose sum is σ = 55298192334. Its totient is φ = 7051008960.

The previous prime is 21153027191. The next prime is 21153027209. The reversal of 21153027204 is 40272035112.

It can be written as a sum of positive squares in only one way, i.e., 19384992900 + 1768034304 = 139230^2 + 42048^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21153027209) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32643237 + ... + 32643884.

Almost surely, 2^21153027204 is an apocalyptic number.

It is an amenable number.

21153027204 is an abundant number, since it is smaller than the sum of its proper divisors (34145165130).

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

21153027204 is a wasteful number, since it uses less digits than its factorization.

21153027204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65287137 (or 65287126 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The spelling of 21153027204 in words is "twenty-one billion, one hundred fifty-three million, twenty-seven thousand, two hundred four".