21142452 has 24 divisors (see below), whose sum is σ = 49724416. Its totient is φ = 6991488.

The previous prime is 21142447. The next prime is 21142463. The reversal of 21142452 is 25424112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5413 + ... + 8460.

Almost surely, 2^21142452 is an apocalyptic number.

It is an amenable number.

21142452 is an abundant number, since it is smaller than the sum of its proper divisors (28581964).

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

21142452 is a wasteful number, since it uses less digits than its factorization.

21142452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14007 (or 14005 counting only the distinct ones).

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

The square root of 21142452 is about 4598.0922130814. The cubic root of 21142452 is about 276.5148445259.

Adding to 21142452 its reverse (25424112), we get a palindrome (46566564).

The spelling of 21142452 in words is "twenty-one million, one hundred forty-two thousand, four hundred fifty-two".