21733940 has 24 divisors (see below), whose sum is σ = 45733632. Its totient is φ = 8676000.

The previous prime is 21733913. The next prime is 21733969. The reversal of 21733940 is 4933712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14297 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (1905568).

Almost surely, 2^21733940 is an apocalyptic number.

21733940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21733940 is an abundant number, since it is smaller than the sum of its proper divisors (23999692).

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

21733940 is a wasteful number, since it uses less digits than its factorization.

21733940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207 (or 2205 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21733940 is about 4661.9673958534. The cubic root of 21733940 is about 279.0697872298.

The spelling of 21733940 in words is "twenty-one million, seven hundred thirty-three thousand, nine hundred forty".