21342452 has 6 divisors (see below), whose sum is σ = 37349298. Its totient is φ = 10671224.

The previous prime is 21342449. The next prime is 21342457. The reversal of 21342452 is 25424312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19589476 + 1752976 = 4426^2 + 1324^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667803 + ... + 2667810.

It is an arithmetic number, because the mean of its divisors is an integer number (6224883).

Almost surely, 2^21342452 is an apocalyptic number.

It is an amenable number.

21342452 is a deficient number, since it is larger than the sum of its proper divisors (16006846).

21342452 is a wasteful number, since it uses less digits than its factorization.

21342452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5335617 (or 5335615 counting only the distinct ones).

The product of its digits is 1920, while the sum is 23.

The square root of 21342452 is about 4619.7891726788. The cubic root of 21342452 is about 277.3840199260.

Adding to 21342452 its reverse (25424312), we get a palindrome (46766764).

The spelling of 21342452 in words is "twenty-one million, three hundred forty-two thousand, four hundred fifty-two".