21694601 has 8 divisors (see below), whose sum is σ = 23015304. Its totient is φ = 20378880.

The previous prime is 21694583. The next prime is 21694609. The reversal of 21694601 is 10649612.

It can be written as a sum of positive squares in 4 ways, for example, as 4687225 + 17007376 = 2165^2 + 4124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21694601 - 2⁶ = 21694537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21694609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11591 + ... + 13331.

It is an arithmetic number, because the mean of its divisors is an integer number (2876913).

Almost surely, 2^21694601 is an apocalyptic number.

It is an amenable number.

21694601 is a deficient number, since it is larger than the sum of its proper divisors (1320703).

21694601 is a wasteful number, since it uses less digits than its factorization.

21694601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21694601 is about 4657.7463434584. The cubic root of 21694601 is about 278.9013110014.

The spelling of 21694601 in words is "twenty-one million, six hundred ninety-four thousand, six hundred one".