21650701 has 4 divisors (see below), whose sum is σ = 21853152. Its totient is φ = 21448252.

The previous prime is 21650689. The next prime is 21650711. The reversal of 21650701 is 10705612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21650701 - 2²¹ = 19553549 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650711) 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, 101065 + ... + 101278.

It is an arithmetic number, because the mean of its divisors is an integer number (5463288).

Almost surely, 2^21650701 is an apocalyptic number.

It is an amenable number.

21650701 is a deficient number, since it is larger than the sum of its proper divisors (202451).

21650701 is a wasteful number, since it uses less digits than its factorization.

21650701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202450.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 21650701 is about 4653.0313775000. The cubic root of 21650701 is about 278.7130608548.

The spelling of 21650701 in words is "twenty-one million, six hundred fifty thousand, seven hundred one".