21609094 has 16 divisors (see below), whose sum is σ = 34983648. Its totient is φ = 9951552.

The previous prime is 21609083. The next prime is 21609101. The reversal of 21609094 is 49090612.

It is a happy number.

It is a congruent number.

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, 22594 + ... + 23530.

It is an arithmetic number, because the mean of its divisors is an integer number (2186478).

Almost surely, 2^21609094 is an apocalyptic number.

21609094 is a deficient number, since it is larger than the sum of its proper divisors (13374554).

21609094 is a wasteful number, since it uses less digits than its factorization.

21609094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 21609094 is about 4648.5582711202. The cubic root of 21609094 is about 278.5344084301.

The spelling of 21609094 in words is "twenty-one million, six hundred nine thousand, ninety-four".