21796481 has 4 divisors (see below), whose sum is σ = 24910272. Its totient is φ = 18682692.

The previous prime is 21796417. The next prime is 21796483. The reversal of 21796481 is 18469712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21796481 - 2⁶ = 21796417 is a prime.

It is a super-2 number, since 2×21796481² = 950173167966722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21796483) 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, 1556885 + ... + 1556898.

It is an arithmetic number, because the mean of its divisors is an integer number (6227568).

Almost surely, 2^21796481 is an apocalyptic number.

It is an amenable number.

21796481 is a deficient number, since it is larger than the sum of its proper divisors (3113791).

21796481 is an equidigital number, since it uses as much as digits as its factorization.

21796481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113790.

The product of its digits is 24192, while the sum is 38.

The square root of 21796481 is about 4668.6701532663. The cubic root of 21796481 is about 279.3372121149.

The spelling of 21796481 in words is "twenty-one million, seven hundred ninety-six thousand, four hundred eighty-one".