21377247240 has 64 divisors (see below), whose sum is σ = 64155677760. Its totient is φ = 5698471680.

The previous prime is 21377247239. The next prime is 21377247277. The reversal of 21377247240 is 4274277312.

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, 303795 + ... + 367485.

It is an arithmetic number, because the mean of its divisors is an integer number (1002432465).

Almost surely, 2^21377247240 is an apocalyptic number.

21377247240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377247240 is an abundant number, since it is smaller than the sum of its proper divisors (42778430520).

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

21377247240 is a wasteful number, since it uses less digits than its factorization.

21377247240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66502 (or 66498 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 39.

The spelling of 21377247240 in words is "twenty-one billion, three hundred seventy-seven million, two hundred forty-seven thousand, two hundred forty".