21623485 has 16 divisors (see below), whose sum is σ = 28304640. Its totient is φ = 15762240.

The previous prime is 21623479. The next prime is 21623509. The reversal of 21623485 is 58432612.

It is not a de Polignac number, because 21623485 - 2³ = 21623477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3030 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (1769040).

Almost surely, 2^21623485 is an apocalyptic number.

It is an amenable number.

21623485 is a deficient number, since it is larger than the sum of its proper divisors (6681155).

21623485 is a wasteful number, since it uses less digits than its factorization.

21623485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308.

The product of its digits is 11520, while the sum is 31.

The square root of 21623485 is about 4650.1059127723. The cubic root of 21623485 is about 278.5962265267.

The spelling of 21623485 in words is "twenty-one million, six hundred twenty-three thousand, four hundred eighty-five".