21459699 has 6 divisors (see below), whose sum is σ = 30997356. Its totient is φ = 14306460.

The previous prime is 21459673. The next prime is 21459701. The reversal of 21459699 is 99695412.

It is not a de Polignac number, because 21459699 - 2⁸ = 21459443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21459629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1192197 + ... + 1192214.

It is an arithmetic number, because the mean of its divisors is an integer number (5166226).

Almost surely, 2^21459699 is an apocalyptic number.

21459699 is a deficient number, since it is larger than the sum of its proper divisors (9537657).

21459699 is a wasteful number, since it uses less digits than its factorization.

21459699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384417 (or 2384414 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 21459699 is about 4632.4614407462. The cubic root of 21459699 is about 277.8910386780.

The spelling of 21459699 in words is "twenty-one million, four hundred fifty-nine thousand, six hundred ninety-nine".