21514510840 has 32 divisors (see below), whose sum is σ = 48421939680. Its totient is φ = 8603263872.

The previous prime is 21514510811. The next prime is 21514510867. The reversal of 21514510840 is 4801541512.

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, 60862 + ... + 216178.

It is an arithmetic number, because the mean of its divisors is an integer number (1513185615).

Almost surely, 2^21514510840 is an apocalyptic number.

21514510840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514510840 is an abundant number, since it is smaller than the sum of its proper divisors (26907428840).

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

21514510840 is a wasteful number, since it uses less digits than its factorization.

21514510840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158791 (or 158787 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The spelling of 21514510840 in words is "twenty-one billion, five hundred fourteen million, five hundred ten thousand, eight hundred forty".