21122524 has 6 divisors (see below), whose sum is σ = 36964424. Its totient is φ = 10561260.

The previous prime is 21122473. The next prime is 21122561. The reversal of 21122524 is 42522112.

It is a super-2 number, since 2×21122524² = 892322040261152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640312 + ... + 2640319.

Almost surely, 2^21122524 is an apocalyptic number.

It is an amenable number.

21122524 is a deficient number, since it is larger than the sum of its proper divisors (15841900).

21122524 is a wasteful number, since it uses less digits than its factorization.

21122524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280635 (or 5280633 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 21122524 is about 4595.9247165288. The cubic root of 21122524 is about 276.4279400675.

Adding to 21122524 its reverse (42522112), we get a palindrome (63644636).

The spelling of 21122524 in words is "twenty-one million, one hundred twenty-two thousand, five hundred twenty-four".