21494625 has 48 divisors (see below), whose sum is σ = 37799424. Its totient is φ = 10836000.

The previous prime is 21494621. The next prime is 21494633. The reversal of 21494625 is 52649412.

It is not a de Polignac number, because 21494625 - 2² = 21494621 is a prime.

Its product of digits (17280) is a multiple of the sum of its prime factors (135).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 499854 + ... + 499896.

It is an arithmetic number, because the mean of its divisors is an integer number (787488).

Almost surely, 2^21494625 is an apocalyptic number.

21494625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21494625 is a deficient number, since it is larger than the sum of its proper divisors (16304799).

21494625 is an equidigital number, since it uses as much as digits as its factorization.

21494625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 82 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 21494625 is about 4636.2296103623. The cubic root of 21494625 is about 278.0417143208.

The spelling of 21494625 in words is "twenty-one million, four hundred ninety-four thousand, six hundred twenty-five".