21162458 has 8 divisors (see below), whose sum is σ = 31880628. Its totient is φ = 10535584.

The previous prime is 21162439. The next prime is 21162469. The reversal of 21162458 is 85426112.

It can be written as a sum of positive squares in 2 ways, for example, as 16265089 + 4897369 = 4033^2 + 2213^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21162458.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 22241 + ... + 23172.

Almost surely, 2^21162458 is an apocalyptic number.

21162458 is a deficient number, since it is larger than the sum of its proper divisors (10718170).

21162458 is a wasteful number, since it uses less digits than its factorization.

21162458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45648.

The product of its digits is 3840, while the sum is 29.

The square root of 21162458 is about 4600.2671661546. The cubic root of 21162458 is about 276.6020342241.

The spelling of 21162458 in words is "twenty-one million, one hundred sixty-two thousand, four hundred fifty-eight".