21452577 has 16 divisors (see below), whose sum is σ = 30624000. Its totient is φ = 13317264.

The previous prime is 21452569. The next prime is 21452591. The reversal of 21452577 is 77525412.

It is not a de Polignac number, because 21452577 - 2³ = 21452569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21452507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174 + ... + 6552.

It is an arithmetic number, because the mean of its divisors is an integer number (1914000).

Almost surely, 2^21452577 is an apocalyptic number.

It is an amenable number.

21452577 is a deficient number, since it is larger than the sum of its proper divisors (9171423).

21452577 is a wasteful number, since it uses less digits than its factorization.

21452577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460.

The product of its digits is 19600, while the sum is 33.

The square root of 21452577 is about 4631.6926711517. The cubic root of 21452577 is about 277.8602933110.

Adding to 21452577 its reverse (77525412), we get a palindrome (98977989).

The spelling of 21452577 in words is "twenty-one million, four hundred fifty-two thousand, five hundred seventy-seven".