21796515 has 96 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 9704448.

The previous prime is 21796513. The next prime is 21796517. The reversal of 21796515 is 51569712.

It is an interprime number because it is at equal distance from previous prime (21796513) and next prime (21796517).

It is not a de Polignac number, because 21796515 - 2¹ = 21796513 is a prime.

It is a super-2 number, since 2×21796515² = 950176132290450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21796515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796513) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 411229 + ... + 411281.

It is an arithmetic number, because the mean of its divisors is an integer number (466830).

Almost surely, 2^21796515 is an apocalyptic number.

21796515 is an abundant number, since it is smaller than the sum of its proper divisors (23019165).

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

21796515 is a wasteful number, since it uses less digits than its factorization.

21796515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 130 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 21796515 is about 4668.6737945588. The cubic root of 21796515 is about 279.3373573594.

The spelling of 21796515 in words is "twenty-one million, seven hundred ninety-six thousand, five hundred fifteen".