21404695 has 24 divisors (see below), whose sum is σ = 28275696. Its totient is φ = 15545088.

The previous prime is 21404689. The next prime is 21404729. The reversal of 21404695 is 59640412.

It is not a de Polignac number, because 21404695 - 2⁷ = 21404567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61512 + ... + 61858.

It is an arithmetic number, because the mean of its divisors is an integer number (1178154).

Almost surely, 2^21404695 is an apocalyptic number.

21404695 is a deficient number, since it is larger than the sum of its proper divisors (6871001).

21404695 is a wasteful number, since it uses less digits than its factorization.

21404695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21404695 is about 4626.5208310349. The cubic root of 21404695 is about 277.6534119128.

The spelling of 21404695 in words is "twenty-one million, four hundred four thousand, six hundred ninety-five".