21256002300 has 72 divisors (see below), whose sum is σ = 66231535216. Its totient is φ = 5232245760.

The previous prime is 21256002293. The next prime is 21256002323. The reversal of 21256002300 is 320065212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2721229 + ... + 2729028.

Almost surely, 2^21256002300 is an apocalyptic number.

21256002300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21256002300 is an abundant number, since it is smaller than the sum of its proper divisors (44975532916).

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

21256002300 is a wasteful number, since it uses less digits than its factorization.

21256002300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450287 (or 5450280 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21256002300 its reverse (320065212), we get a palindrome (21576067512).

The spelling of 21256002300 in words is "twenty-one billion, two hundred fifty-six million, two thousand, three hundred".