21514771680 has 48 divisors (see below), whose sum is σ = 67771532304. Its totient is φ = 5737272320.

The previous prime is 21514771679. The next prime is 21514771687. The reversal of 21514771680 is 8617741512.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514771687) by changing a digit.

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, 22410741 + ... + 22411700.

It is an arithmetic number, because the mean of its divisors is an integer number (1411906923).

Almost surely, 2^21514771680 is an apocalyptic number.

21514771680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514771680 is an abundant number, since it is smaller than the sum of its proper divisors (46256760624).

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

21514771680 is a wasteful number, since it uses less digits than its factorization.

21514771680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44822459 (or 44822451 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The spelling of 21514771680 in words is "twenty-one billion, five hundred fourteen million, seven hundred seventy-one thousand, six hundred eighty".