21244933536 has 96 divisors (see below), whose sum is σ = 56916494208. Its totient is φ = 6937082880.

The previous prime is 21244933529. The next prime is 21244933537. The reversal of 21244933536 is 63533944212.

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

It is not an unprimeable number, because it can be changed into a prime (21244933537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1060186 + ... + 1080038.

It is an arithmetic number, because the mean of its divisors is an integer number (592880148).

Almost surely, 2^21244933536 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 21244933536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28458247104).

21244933536 is an abundant number, since it is smaller than the sum of its proper divisors (35671560672).

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

21244933536 is a wasteful number, since it uses less digits than its factorization.

21244933536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20094 (or 20086 counting only the distinct ones).

The product of its digits is 466560, while the sum is 42.

The spelling of 21244933536 in words is "twenty-one billion, two hundred forty-four million, nine hundred thirty-three thousand, five hundred thirty-six".