21531052 has 12 divisors (see below), whose sum is σ = 37782976. Its totient is φ = 10735920.

The previous prime is 21531049. The next prime is 21531071. The reversal of 21531052 is 25013512.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5724 + ... + 8707.

Almost surely, 2^21531052 is an apocalyptic number.

It is an amenable number.

21531052 is a deficient number, since it is larger than the sum of its proper divisors (16251924).

21531052 is a wasteful number, since it uses less digits than its factorization.

21531052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14808 (or 14806 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21531052 is about 4640.1564628792. The cubic root of 21531052 is about 278.1986916963.

Adding to 21531052 its reverse (25013512), we get a palindrome (46544564).

The spelling of 21531052 in words is "twenty-one million, five hundred thirty-one thousand, fifty-two".