21162479 has 4 divisors (see below), whose sum is σ = 22790376. Its totient is φ = 19534584.

The previous prime is 21162469. The next prime is 21162487. The reversal of 21162479 is 97426112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21162479 - 2²⁴ = 4385263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162439) 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, 813929 + ... + 813954.

It is an arithmetic number, because the mean of its divisors is an integer number (5697594).

Almost surely, 2^21162479 is an apocalyptic number.

21162479 is a deficient number, since it is larger than the sum of its proper divisors (1627897).

21162479 is a wasteful number, since it uses less digits than its factorization.

21162479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627896.

The product of its digits is 6048, while the sum is 32.

The square root of 21162479 is about 4600.2694486302. The cubic root of 21162479 is about 276.6021257169.

The spelling of 21162479 in words is "twenty-one million, one hundred sixty-two thousand, four hundred seventy-nine".