21623466 has 32 divisors (see below), whose sum is σ = 44706240. Its totient is φ = 6967296.

The previous prime is 21623423. The next prime is 21623471. The reversal of 21623466 is 66432612.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 56865 + ... + 57243.

It is an arithmetic number, because the mean of its divisors is an integer number (1397070).

Almost surely, 2^21623466 is an apocalyptic number.

21623466 is an abundant number, since it is smaller than the sum of its proper divisors (23082774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21623466 is a wasteful number, since it uses less digits than its factorization.

21623466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its digits is 10368, while the sum is 30.

The square root of 21623466 is about 4650.1038698076. The cubic root of 21623466 is about 278.5961449282.

The spelling of 21623466 in words is "twenty-one million, six hundred twenty-three thousand, four hundred sixty-six".