21485694 has 64 divisors (see below), whose sum is σ = 47980800. Its totient is φ = 6386688.

The previous prime is 21485689. The next prime is 21485701. The reversal of 21485694 is 49658412.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221454 + ... + 221550.

It is an arithmetic number, because the mean of its divisors is an integer number (749700).

Almost surely, 2^21485694 is an apocalyptic number.

21485694 is an abundant number, since it is smaller than the sum of its proper divisors (26495106).

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

21485694 is a wasteful number, since it uses less digits than its factorization.

21485694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217.

The product of its digits is 69120, while the sum is 39.

The square root of 21485694 is about 4635.2663353900. The cubic root of 21485694 is about 278.0032002806.

The spelling of 21485694 in words is "twenty-one million, four hundred eighty-five thousand, six hundred ninety-four".