21887461580 has 24 divisors (see below), whose sum is σ = 48667415328. Its totient is φ = 8239985408.

The previous prime is 21887461579. The next prime is 21887461621. The reversal of 21887461580 is 8516478812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32187104 + ... + 32187783.

It is an arithmetic number, because the mean of its divisors is an integer number (2027808972).

Almost surely, 2^21887461580 is an apocalyptic number.

21887461580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21887461580 is an abundant number, since it is smaller than the sum of its proper divisors (26779953748).

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

21887461580 is a wasteful number, since it uses less digits than its factorization.

21887461580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64374913 (or 64374911 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 21887461580 in words is "twenty-one billion, eight hundred eighty-seven million, four hundred sixty-one thousand, five hundred eighty".