21385253080 has 32 divisors (see below), whose sum is σ = 49776022800. Its totient is φ = 8259131776.

The previous prime is 21385253023. The next prime is 21385253093. The reversal of 21385253080 is 8035258312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9216622 + ... + 9218941.

Almost surely, 2^21385253080 is an apocalyptic number.

21385253080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21385253080 is an abundant number, since it is smaller than the sum of its proper divisors (28390769720).

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

21385253080 is a wasteful number, since it uses less digits than its factorization.

21385253080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18435603 (or 18435599 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 21385253080 in words is "twenty-one billion, three hundred eighty-five million, two hundred fifty-three thousand, eighty".