21899606872 has 64 divisors (see below), whose sum is σ = 50779411200. Its totient is φ = 8705024640.

The previous prime is 21899606863. The next prime is 21899606881. The reversal of 21899606872 is 27860699812.

It is an interprime number because it is at equal distance from previous prime (21899606863) and next prime (21899606881).

It is a super-2 number, since 2×21899606872² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 482028 + ... + 525499.

It is an arithmetic number, because the mean of its divisors is an integer number (793428300).

Almost surely, 2^21899606872 is an apocalyptic number.

21899606872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21899606872 is an abundant number, since it is smaller than the sum of its proper divisors (28879804328).

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

21899606872 is a wasteful number, since it uses less digits than its factorization.

21899606872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007576 (or 1007572 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 21899606872 in words is "twenty-one billion, eight hundred ninety-nine million, six hundred six thousand, eight hundred seventy-two".