21662701 has 4 divisors (see below), whose sum is σ = 21706272. Its totient is φ = 21619132.

The previous prime is 21662699. The next prime is 21662731. The reversal of 21662701 is 10726612.

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 21662701 - 2¹ = 21662699 is a prime.

It is a super-2 number, since 2×21662701² = 938545229230802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21662731) 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, 21031 + ... + 22036.

It is an arithmetic number, because the mean of its divisors is an integer number (5426568).

Almost surely, 2^21662701 is an apocalyptic number.

It is an amenable number.

21662701 is a deficient number, since it is larger than the sum of its proper divisors (43571).

21662701 is an equidigital number, since it uses as much as digits as its factorization.

21662701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43570.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21662701 is about 4654.3206808298. The cubic root of 21662701 is about 278.7645440071.

The spelling of 21662701 in words is "twenty-one million, six hundred sixty-two thousand, seven hundred one".