21470683 has 4 divisors (see below), whose sum is σ = 23122288. Its totient is φ = 19819080.

The previous prime is 21470653. The next prime is 21470723. The reversal of 21470683 is 38607412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21470683 - 2⁵ = 21470651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21470623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825783 + ... + 825808.

It is an arithmetic number, because the mean of its divisors is an integer number (5780572).

Almost surely, 2^21470683 is an apocalyptic number.

21470683 is a deficient number, since it is larger than the sum of its proper divisors (1651605).

21470683 is a wasteful number, since it uses less digits than its factorization.

21470683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651604.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21470683 is about 4633.6468359166. The cubic root of 21470683 is about 277.9384427996.

The spelling of 21470683 in words is "twenty-one million, four hundred seventy thousand, six hundred eighty-three".