21933437316 has 144 divisors (see below), whose sum is σ = 60836041728. Its totient is φ = 6024525120.

The previous prime is 21933437299. The next prime is 21933437359. The reversal of 21933437316 is 61373433912.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13480095 + ... + 13481721.

It is an arithmetic number, because the mean of its divisors is an integer number (422472512).

Almost surely, 2^21933437316 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 21933437316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30418020864).

21933437316 is an abundant number, since it is smaller than the sum of its proper divisors (38902604412).

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

21933437316 is a wasteful number, since it uses less digits than its factorization.

21933437316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870 (or 1837 counting only the distinct ones).

The product of its digits is 244944, while the sum is 42.

The spelling of 21933437316 in words is "twenty-one billion, nine hundred thirty-three million, four hundred thirty-seven thousand, three hundred sixteen".