21863505080 has 16 divisors (see below), whose sum is σ = 49192886520. Its totient is φ = 8745402016.

The previous prime is 21863505077. The next prime is 21863505113. The reversal of 21863505080 is 8050536812.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 273293774 + ... + 273293853.

Almost surely, 2^21863505080 is an apocalyptic number.

21863505080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21863505080 is an abundant number, since it is smaller than the sum of its proper divisors (27329381440).

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

21863505080 is a wasteful number, since it uses less digits than its factorization.

21863505080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546587638 (or 546587634 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 21863505080 in words is "twenty-one billion, eight hundred sixty-three million, five hundred five thousand, eighty".