21451694 has 16 divisors (see below), whose sum is σ = 35417520. Its totient is φ = 9663360.

The previous prime is 21451673. The next prime is 21451723. The reversal of 21451694 is 49615412.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21451694.

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, 1829 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (2213595).

Almost surely, 2^21451694 is an apocalyptic number.

21451694 is a deficient number, since it is larger than the sum of its proper divisors (13965826).

21451694 is a wasteful number, since it uses less digits than its factorization.

21451694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8755.

The product of its digits is 8640, while the sum is 32.

The square root of 21451694 is about 4631.5973486477. The cubic root of 21451694 is about 277.8564809640.

The spelling of 21451694 in words is "twenty-one million, four hundred fifty-one thousand, six hundred ninety-four".