21479234 has 16 divisors (see below), whose sum is σ = 38760000. Its totient is φ = 8720784.

The previous prime is 21479221. The next prime is 21479243. The reversal of 21479234 is 43297412.

It is a super-2 number, since 2×21479234² = 922714986453512, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21479234.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40109 + ... + 40640.

It is an arithmetic number, because the mean of its divisors is an integer number (2422500).

Almost surely, 2^21479234 is an apocalyptic number.

21479234 is a deficient number, since it is larger than the sum of its proper divisors (17280766).

21479234 is a wasteful number, since it uses less digits than its factorization.

21479234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80777.

The product of its digits is 12096, while the sum is 32.

The square root of 21479234 is about 4634.5694514162. The cubic root of 21479234 is about 277.9753355272.

The spelling of 21479234 in words is "twenty-one million, four hundred seventy-nine thousand, two hundred thirty-four".