21984995802 has 32 divisors (see below), whose sum is σ = 54819730944. Its totient is φ = 5710388400.

The previous prime is 21984995797. The next prime is 21984995807. The reversal of 21984995802 is 20859948912.

It is an interprime number because it is at equal distance from previous prime (21984995797) and next prime (21984995807).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21984995807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23792824 + ... + 23793747.

It is an arithmetic number, because the mean of its divisors is an integer number (1713116592).

Almost surely, 2^21984995802 is an apocalyptic number.

21984995802 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21984995802 is an abundant number, since it is smaller than the sum of its proper divisors (32834735142).

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

21984995802 is a wasteful number, since it uses less digits than its factorization.

21984995802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47586594.

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 21984995802 in words is "twenty-one billion, nine hundred eighty-four million, nine hundred ninety-five thousand, eight hundred two".