21152976 has 80 divisors (see below), whose sum is σ = 59579520. Its totient is φ = 6428160.

The previous prime is 21152969. The next prime is 21152983. The reversal of 21152976 is 67925112.

It is an interprime number because it is at equal distance from previous prime (21152969) and next prime (21152983).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67861 + ... + 68171.

It is an arithmetic number, because the mean of its divisors is an integer number (744744).

Almost surely, 2^21152976 is an apocalyptic number.

21152976 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21152976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29789760).

21152976 is an abundant number, since it is smaller than the sum of its proper divisors (38426544).

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

21152976 is a wasteful number, since it uses less digits than its factorization.

21152976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 438 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 21152976 is about 4599.2364583700. The cubic root of 21152976 is about 276.5607168387.

The spelling of 21152976 in words is "twenty-one million, one hundred fifty-two thousand, nine hundred seventy-six".