21752697 has 8 divisors (see below), whose sum is σ = 30003840. Its totient is φ = 14001680.

The previous prime is 21752657. The next prime is 21752699. The reversal of 21752697 is 79625712.

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

It is a cyclic number.

It is not a de Polignac number, because 21752697 - 2⁷ = 21752569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21752699) 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, 124929 + ... + 125102.

It is an arithmetic number, because the mean of its divisors is an integer number (3750480).

Almost surely, 2^21752697 is an apocalyptic number.

It is an amenable number.

21752697 is a deficient number, since it is larger than the sum of its proper divisors (8251143).

21752697 is a wasteful number, since it uses less digits than its factorization.

21752697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250063.

The product of its digits is 52920, while the sum is 39.

The square root of 21752697 is about 4663.9786663320. The cubic root of 21752697 is about 279.1500458311.

The spelling of 21752697 in words is "twenty-one million, seven hundred fifty-two thousand, six hundred ninety-seven".