21142860984 has 96 divisors (see below), whose sum is σ = 66551472000. Its totient is φ = 5938422336.

The previous prime is 21142860967. The next prime is 21142860989. The reversal of 21142860984 is 48906824112.

21142860984 is a `hidden beast` number, since 2 + 1 + 14 + 28 + 609 + 8 + 4 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142860989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325774 + ... + 385245.

It is an arithmetic number, because the mean of its divisors is an integer number (693244500).

Almost surely, 2^21142860984 is an apocalyptic number.

21142860984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21142860984 is an abundant number, since it is smaller than the sum of its proper divisors (45408611016).

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

21142860984 is a wasteful number, since it uses less digits than its factorization.

21142860984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711097 (or 711090 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 21142860984 in words is "twenty-one billion, one hundred forty-two million, eight hundred sixty thousand, nine hundred eighty-four".