22216491 has 64 divisors (see below), whose sum is σ = 39321600. Its totient is φ = 12247200.

The previous prime is 22216457. The next prime is 22216507. The reversal of 22216491 is 19461222.

It is not a de Polignac number, because 22216491 - 2¹¹ = 22214443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (22216451) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174870 + ... + 174996.

It is an arithmetic number, because the mean of its divisors is an integer number (614400).

Almost surely, 2^22216491 is an apocalyptic number.

22216491 is a deficient number, since it is larger than the sum of its proper divisors (17105109).

22216491 is a wasteful number, since it uses less digits than its factorization.

22216491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 22216491 is about 4713.4372807963. The cubic root of 22216491 is about 281.1200501890.

The spelling of 22216491 in words is "twenty-two million, two hundred sixteen thousand, four hundred ninety-one".