21452657 has 8 divisors (see below), whose sum is σ = 23243616. Its totient is φ = 19720512.

The previous prime is 21452611. The next prime is 21452659. The reversal of 21452657 is 75625412.

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 21452657 - 2¹² = 21448561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452659) 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, 13943 + ... + 15404.

It is an arithmetic number, because the mean of its divisors is an integer number (2905452).

Almost surely, 2^21452657 is an apocalyptic number.

It is an amenable number.

21452657 is a deficient number, since it is larger than the sum of its proper divisors (1790959).

21452657 is a wasteful number, since it uses less digits than its factorization.

21452657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29407.

The product of its digits is 16800, while the sum is 32.

The square root of 21452657 is about 4631.7013072952. The cubic root of 21452657 is about 277.8606387054.

The spelling of 21452657 in words is "twenty-one million, four hundred fifty-two thousand, six hundred fifty-seven".