21885018892 has 12 divisors (see below), whose sum is σ = 41780490696. Its totient is φ = 9947735840.

The previous prime is 21885018803. The next prime is 21885018893. The reversal of 21885018892 is 29881058812.

It is not an unprimeable number, because it can be changed into a prime (21885018893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248693353 + ... + 248693440.

It is an arithmetic number, because the mean of its divisors is an integer number (3481707558).

Almost surely, 2^21885018892 is an apocalyptic number.

21885018892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21885018892 is a deficient number, since it is larger than the sum of its proper divisors (19895471804).

21885018892 is a wasteful number, since it uses less digits than its factorization.

21885018892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497386808 (or 497386806 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 52.

The spelling of 21885018892 in words is "twenty-one billion, eight hundred eighty-five million, eighteen thousand, eight hundred ninety-two".