21898619904 has 352 divisors, whose sum is σ = 72583672320. Its totient is φ = 5726011392.

The previous prime is 21898619863. The next prime is 21898619929. The reversal of 21898619904 is 40991689812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13525207 + ... + 13526825.

Almost surely, 2^21898619904 is an apocalyptic number.

21898619904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21898619904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36291836160).

21898619904 is an abundant number, since it is smaller than the sum of its proper divisors (50685052416).

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

21898619904 is a wasteful number, since it uses less digits than its factorization.

21898619904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 57.

The spelling of 21898619904 in words is "twenty-one billion, eight hundred ninety-eight million, six hundred nineteen thousand, nine hundred four".