21733960388 has 96 divisors (see below), whose sum is σ = 47124000000. Its totient is φ = 8742214656.

The previous prime is 21733960379. The next prime is 21733960421. The reversal of 21733960388 is 88306933712.

It is a happy number.

It is a super-2 number, since 2×21733960388² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2837588 + ... + 2845236.

It is an arithmetic number, because the mean of its divisors is an integer number (490875000).

Almost surely, 2^21733960388 is an apocalyptic number.

21733960388 is a gapful number since it is divisible by the number (28) 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 21733960388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23562000000).

21733960388 is an abundant number, since it is smaller than the sum of its proper divisors (25390039612).

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

21733960388 is a wasteful number, since it uses less digits than its factorization.

21733960388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7802 (or 7786 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 21733960388 in words is "twenty-one billion, seven hundred thirty-three million, nine hundred sixty thousand, three hundred eighty-eight".