21999963936 has 96 divisors (see below), whose sum is σ = 60068929536. Its totient is φ = 7042464000.

The previous prime is 21999963929. The next prime is 21999963971. The reversal of 21999963936 is 63936999912.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21999963936² (a number of 21 digits) contains 22 as substring.

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, 361641 + ... + 418071.

It is an arithmetic number, because the mean of its divisors is an integer number (625718016).

Almost surely, 2^21999963936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21999963936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30034464768).

21999963936 is an abundant number, since it is smaller than the sum of its proper divisors (38068965600).

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

21999963936 is a wasteful number, since it uses less digits than its factorization.

21999963936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56606 (or 56598 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 66.

The spelling of 21999963936 in words is "twenty-one billion, nine hundred ninety-nine million, nine hundred sixty-three thousand, nine hundred thirty-six".