21790467 has 6 divisors (see below), whose sum is σ = 31475132. Its totient is φ = 14526972.

The previous prime is 21790459. The next prime is 21790471. The reversal of 21790467 is 76409712.

It is a happy number.

It is not a de Polignac number, because 21790467 - 2³ = 21790459 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21790487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1210573 + ... + 1210590.

Almost surely, 2^21790467 is an apocalyptic number.

21790467 is a deficient number, since it is larger than the sum of its proper divisors (9684665).

21790467 is a wasteful number, since it uses less digits than its factorization.

21790467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421169 (or 2421166 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 21790467 is about 4668.0260282051. The cubic root of 21790467 is about 279.3115185404.

The spelling of 21790467 in words is "twenty-one million, seven hundred ninety thousand, four hundred sixty-seven".