21694101 has 32 divisors (see below), whose sum is σ = 34581120. Its totient is φ = 11923200.

The previous prime is 21694069. The next prime is 21694133. The reversal of 21694101 is 10149612.

It is an interprime number because it is at equal distance from previous prime (21694069) and next prime (21694133).

It is not a de Polignac number, because 21694101 - 2⁵ = 21694069 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21694151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25755 + ... + 26583.

It is an arithmetic number, because the mean of its divisors is an integer number (1080660).

Almost surely, 2^21694101 is an apocalyptic number.

It is an amenable number.

21694101 is a deficient number, since it is larger than the sum of its proper divisors (12887019).

21694101 is a wasteful number, since it uses less digits than its factorization.

21694101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21694101 is about 4657.6926691228. The cubic root of 21694101 is about 278.8991683527.

The spelling of 21694101 in words is "twenty-one million, six hundred ninety-four thousand, one hundred one".