21596940 has 36 divisors (see below), whose sum is σ = 65511264. Its totient is φ = 5759136.

The previous prime is 21596921. The next prime is 21596951. The reversal of 21596940 is 4969512.

21596940 is a `hidden beast` number, since 21 + 596 + 9 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21596895 and 21596904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59812 + ... + 60171.

Almost surely, 2^21596940 is an apocalyptic number.

21596940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21596940 is an abundant number, since it is smaller than the sum of its proper divisors (43914324).

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

21596940 is a wasteful number, since it uses less digits than its factorization.

21596940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119998 (or 119993 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 21596940 is about 4647.2508002044. The cubic root of 21596940 is about 278.4821782273.

The spelling of 21596940 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred forty".