21596964 has 24 divisors (see below), whose sum is σ = 50497440. Its totient is φ = 7184064.

The previous prime is 21596959. The next prime is 21596969. The reversal of 21596964 is 46969512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21596959) and next prime (21596969).

It is not an unprimeable number, because it can be changed into a prime (21596969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5247 + ... + 8409.

It is an arithmetic number, because the mean of its divisors is an integer number (2104060).

Almost surely, 2^21596964 is an apocalyptic number.

It is an amenable number.

21596964 is an abundant number, since it is smaller than the sum of its proper divisors (28900476).

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

21596964 is a wasteful number, since it uses less digits than its factorization.

21596964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739 (or 3737 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 21596964 is about 4647.2533823754. The cubic root of 21596964 is about 278.4822813835.

It can be divided in two parts, 215 and 96964, that added together give a palindrome (97179).

The spelling of 21596964 in words is "twenty-one million, five hundred ninety-six thousand, nine hundred sixty-four".