21899418882 has 64 divisors (see below), whose sum is σ = 49110171264. Its totient is φ = 6451799040.

The previous prime is 21899418841. The next prime is 21899418883. The reversal of 21899418882 is 28881499812.

It is not an unprimeable number, because it can be changed into a prime (21899418883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4131658 + ... + 4136954.

It is an arithmetic number, because the mean of its divisors is an integer number (767346426).

Almost surely, 2^21899418882 is an apocalyptic number.

21899418882 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21899418882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24555085632).

21899418882 is an abundant number, since it is smaller than the sum of its proper divisors (27210752382).

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

21899418882 is a wasteful number, since it uses less digits than its factorization.

21899418882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7043.

The product of its digits is 5308416, while the sum is 60.

The spelling of 21899418882 in words is "twenty-one billion, eight hundred ninety-nine million, four hundred eighteen thousand, eight hundred eighty-two".