21896372432 has 80 divisors (see below), whose sum is σ = 46727259264. Its totient is φ = 9857280000.

The previous prime is 21896372429. The next prime is 21896372441. The reversal of 21896372432 is 23427369812.

It is a super-2 number, since 2×21896372432² (a number of 21 digits) contains 22 as substring.

Its product of digits (870912) is a multiple of the sum of its prime factors (2268).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14490557 + ... + 14492067.

Almost surely, 2^21896372432 is an apocalyptic number.

21896372432 is a gapful number since it is divisible by the number (22) 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 21896372432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23363629632).

21896372432 is an abundant number, since it is smaller than the sum of its proper divisors (24830886832).

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

21896372432 is a wasteful number, since it uses less digits than its factorization.

21896372432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268 (or 2262 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The spelling of 21896372432 in words is "twenty-one billion, eight hundred ninety-six million, three hundred seventy-two thousand, four hundred thirty-two".