21345814680 has 64 divisors (see below), whose sum is σ = 64071302400. Its totient is φ = 5689207680.

The previous prime is 21345814663. The next prime is 21345814697. The reversal of 21345814680 is 8641854312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21345814663) and next prime (21345814697).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185661 + ... + 277779.

It is an arithmetic number, because the mean of its divisors is an integer number (1001114100).

Almost surely, 2^21345814680 is an apocalyptic number.

21345814680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21345814680 is an abundant number, since it is smaller than the sum of its proper divisors (42725487720).

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

21345814680 is a wasteful number, since it uses less digits than its factorization.

21345814680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94064 (or 94060 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 21345814680 in words is "twenty-one billion, three hundred forty-five million, eight hundred fourteen thousand, six hundred eighty".