21699454 has 24 divisors (see below), whose sum is σ = 38105640. Its totient is φ = 9240336.

The previous prime is 21699449. The next prime is 21699481. The reversal of 21699454 is 45499612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16924 + ... + 18160.

It is an arithmetic number, because the mean of its divisors is an integer number (1587735).

Almost surely, 2^21699454 is an apocalyptic number.

21699454 is a deficient number, since it is larger than the sum of its proper divisors (16406186).

21699454 is a wasteful number, since it uses less digits than its factorization.

21699454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432 (or 1425 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 21699454 is about 4658.2672744273. The cubic root of 21699454 is about 278.9221058396.

The spelling of 21699454 in words is "twenty-one million, six hundred ninety-nine thousand, four hundred fifty-four".