21352474 has 24 divisors (see below), whose sum is σ = 37841472. Its totient is φ = 8957520.

The previous prime is 21352451. The next prime is 21352477. The reversal of 21352474 is 47425312.

It is not an unprimeable number, because it can be changed into a prime (21352477) 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, 847 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (1576728).

Almost surely, 2^21352474 is an apocalyptic number.

21352474 is a deficient number, since it is larger than the sum of its proper divisors (16488998).

21352474 is a wasteful number, since it uses less digits than its factorization.

21352474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782 (or 5769 counting only the distinct ones).

The product of its digits is 6720, while the sum is 28.

The square root of 21352474 is about 4620.8737269049. The cubic root of 21352474 is about 277.4274311771.

Adding to 21352474 its reverse (47425312), we get a palindrome (68777786).

The spelling of 21352474 in words is "twenty-one million, three hundred fifty-two thousand, four hundred seventy-four".