21469513 has 16 divisors (see below), whose sum is σ = 23900800. Its totient is φ = 19160064.

The previous prime is 21469493. The next prime is 21469517. The reversal of 21469513 is 31596412.

It is a cyclic number.

It is not a de Polignac number, because 21469513 - 2⁹ = 21469001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21469517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107788 + ... + 107986.

It is an arithmetic number, because the mean of its divisors is an integer number (1493800).

Almost surely, 2^21469513 is an apocalyptic number.

It is an amenable number.

21469513 is a deficient number, since it is larger than the sum of its proper divisors (2431287).

21469513 is a wasteful number, since it uses less digits than its factorization.

21469513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448.

The product of its digits is 6480, while the sum is 31.

The square root of 21469513 is about 4633.5205837462. The cubic root of 21469513 is about 277.9333941497.

The spelling of 21469513 in words is "twenty-one million, four hundred sixty-nine thousand, five hundred thirteen".