21494164 has 12 divisors (see below), whose sum is σ = 37681588. Its totient is φ = 10728000.

The previous prime is 21494159. The next prime is 21494173. The reversal of 21494164 is 46149412.

It can be written as a sum of positive squares in 2 ways, for example, as 16240900 + 5253264 = 4030^2 + 2292^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067 + ... + 6874.

Almost surely, 2^21494164 is an apocalyptic number.

It is an amenable number.

21494164 is a deficient number, since it is larger than the sum of its proper divisors (16187424).

21494164 is a wasteful number, since it uses less digits than its factorization.

21494164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9546 (or 9544 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21494164 is about 4636.1798929722. The cubic root of 21494164 is about 278.0397265657.

The spelling of 21494164 in words is "twenty-one million, four hundred ninety-four thousand, one hundred sixty-four".