21488956 has 12 divisors (see below), whose sum is σ = 38315592. Its totient is φ = 10541648.

The previous prime is 21488953. The next prime is 21488963. The reversal of 21488956 is 65988412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50470 + ... + 50893.

It is an arithmetic number, because the mean of its divisors is an integer number (3192966).

Almost surely, 2^21488956 is an apocalyptic number.

It is an amenable number.

21488956 is a deficient number, since it is larger than the sum of its proper divisors (16826636).

21488956 is a wasteful number, since it uses less digits than its factorization.

21488956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101420 (or 101418 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 21488956 is about 4635.6181896269. The cubic root of 21488956 is about 278.0172685648.

The spelling of 21488956 in words is "twenty-one million, four hundred eighty-eight thousand, nine hundred fifty-six".