21452124 has 24 divisors (see below), whose sum is σ = 51670528. Its totient is φ = 6919920.

The previous prime is 21452111. The next prime is 21452131. The reversal of 21452124 is 42125412.

It is a super-2 number, since 2×21452124² = 920387248222752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21452124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28462 + ... + 29205.

Almost surely, 2^21452124 is an apocalyptic number.

It is an amenable number.

21452124 is an abundant number, since it is smaller than the sum of its proper divisors (30218404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21452124 is a wasteful number, since it uses less digits than its factorization.

21452124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57705 (or 57703 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 21452124 is about 4631.6437686852. The cubic root of 21452124 is about 277.8583374994.

Adding to 21452124 its reverse (42125412), we get a palindrome (63577536).

The spelling of 21452124 in words is "twenty-one million, four hundred fifty-two thousand, one hundred twenty-four".