21452697 has 12 divisors (see below), whose sum is σ = 35414080. Its totient is φ = 12258648.

The previous prime is 21452677. The next prime is 21452699. The reversal of 21452697 is 79625412.

It is not a de Polignac number, because 21452697 - 2⁷ = 21452569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21452699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170197 + ... + 170322.

Almost surely, 2^21452697 is an apocalyptic number.

It is an amenable number.

21452697 is a deficient number, since it is larger than the sum of its proper divisors (13961383).

21452697 is a wasteful number, since it uses less digits than its factorization.

21452697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340532 (or 340529 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21452697 is about 4631.7056253609. The cubic root of 21452697 is about 277.8608114022.

The spelling of 21452697 in words is "twenty-one million, four hundred fifty-two thousand, six hundred ninety-seven".