21280551204 has 36 divisors (see below), whose sum is σ = 54579048272. Its totient is φ = 6448651440.

The previous prime is 21280551203. The next prime is 21280551217. The reversal of 21280551204 is 40215508212.

It is not an unprimeable number, because it can be changed into a prime (21280551203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7326562 + ... + 7329465.

Almost surely, 2^21280551204 is an apocalyptic number.

It is an amenable number.

21280551204 is an abundant number, since it is smaller than the sum of its proper divisors (33298497068).

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

21280551204 is a wasteful number, since it uses less digits than its factorization.

21280551204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14656056 (or 14656043 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The spelling of 21280551204 in words is "twenty-one billion, two hundred eighty million, five hundred fifty-one thousand, two hundred four".