21365701 has 8 divisors (see below), whose sum is σ = 24634944. Its totient is φ = 18150720.

The previous prime is 21365699. The next prime is 21365723. The reversal of 21365701 is 10756312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21365701 - 2¹ = 21365699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12715 + ... + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (3079368).

Almost surely, 2^21365701 is an apocalyptic number.

It is an amenable number.

21365701 is a deficient number, since it is larger than the sum of its proper divisors (3269243).

21365701 is a wasteful number, since it uses less digits than its factorization.

21365701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27131.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 21365701 is about 4622.3047281632. The cubic root of 21365701 is about 277.4847044027.

The spelling of 21365701 in words is "twenty-one million, three hundred sixty-five thousand, seven hundred one".