21652697 has 4 divisors (see below), whose sum is σ = 23621136. Its totient is φ = 19684260.

The previous prime is 21652691. The next prime is 21652703. The reversal of 21652697 is 79625612.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (21652691) and next prime (21652703).

It is a cyclic number.

It is not a de Polignac number, because 21652697 - 2⁴ = 21652681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21652697.

It is not an unprimeable number, because it can be changed into a prime (21652691) 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, 984203 + ... + 984224.

It is an arithmetic number, because the mean of its divisors is an integer number (5905284).

Almost surely, 2^21652697 is an apocalyptic number.

It is an amenable number.

21652697 is a deficient number, since it is larger than the sum of its proper divisors (1968439).

21652697 is a wasteful number, since it uses less digits than its factorization.

21652697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968438.

The product of its digits is 45360, while the sum is 38.

The square root of 21652697 is about 4653.2458563888. The cubic root of 21652697 is about 278.7216255379.

The spelling of 21652697 in words is "twenty-one million, six hundred fifty-two thousand, six hundred ninety-seven".