21960491 has 8 divisors (see below), whose sum is σ = 25152000. Its totient is φ = 18782568.

The previous prime is 21960473. The next prime is 21960503. The reversal of 21960491 is 19406912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21960491 is a prime.

It is a super-2 number, since 2×21960491² = 964526329922162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21960451) 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, 350 + ... + 6636.

It is an arithmetic number, because the mean of its divisors is an integer number (3144000).

Almost surely, 2^21960491 is an apocalyptic number.

21960491 is a deficient number, since it is larger than the sum of its proper divisors (3191509).

21960491 is an equidigital number, since it uses as much as digits as its factorization.

21960491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6793.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21960491 is about 4686.2021936745. The cubic root of 21960491 is about 280.0360965368.

The spelling of 21960491 in words is "twenty-one million, nine hundred sixty thousand, four hundred ninety-one".