21468688940 has 24 divisors (see below), whose sum is σ = 45115208880. Its totient is φ = 8581578048.

The previous prime is 21468688939. The next prime is 21468688963. The reversal of 21468688940 is 4988686412.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 338687 + ... + 397046.

It is an arithmetic number, because the mean of its divisors is an integer number (1879800370).

Almost surely, 2^21468688940 is an apocalyptic number.

21468688940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21468688940 is an abundant number, since it is smaller than the sum of its proper divisors (23646519940).

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

21468688940 is a wasteful number, since it uses less digits than its factorization.

21468688940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737201 (or 737199 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 56.

The spelling of 21468688940 in words is "twenty-one billion, four hundred sixty-eight million, six hundred eighty-eight thousand, nine hundred forty".