21933516 has 48 divisors (see below), whose sum is σ = 56488320. Its totient is φ = 6568320.

The previous prime is 21933503. The next prime is 21933517. The reversal of 21933516 is 61533912.

It is not an unprimeable number, because it can be changed into a prime (21933517) 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, 10815 + ... + 12681.

It is an arithmetic number, because the mean of its divisors is an integer number (1176840).

Almost surely, 2^21933516 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 21933516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28244160).

21933516 is an abundant number, since it is smaller than the sum of its proper divisors (34554804).

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

21933516 is a wasteful number, since it uses less digits than its factorization.

21933516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1974 (or 1972 counting only the distinct ones).

The product of its digits is 4860, while the sum is 30.

The square root of 21933516 is about 4683.3231791112. The cubic root of 21933516 is about 279.9213894967.

The spelling of 21933516 in words is "twenty-one million, nine hundred thirty-three thousand, five hundred sixteen".