21252574 has 24 divisors (see below), whose sum is σ = 37284840. Its totient is φ = 9058896.

The previous prime is 21252571. The next prime is 21252589. The reversal of 21252574 is 47525212.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252571) 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, 21969 + ... + 22915.

It is an arithmetic number, because the mean of its divisors is an integer number (1553535).

Almost surely, 2^21252574 is an apocalyptic number.

21252574 is a deficient number, since it is larger than the sum of its proper divisors (16032266).

21252574 is a wasteful number, since it uses less digits than its factorization.

21252574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192 (or 1185 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 21252574 is about 4610.0514096917. The cubic root of 21252574 is about 276.9940959786.

Adding to 21252574 its reverse (47525212), we get a palindrome (68777786).

The spelling of 21252574 in words is "twenty-one million, two hundred fifty-two thousand, five hundred seventy-four".