21234452 has 12 divisors (see below), whose sum is σ = 37432500. Its totient is φ = 10539456.

The previous prime is 21234443. The next prime is 21234461. The reversal of 21234452 is 25443212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21234443) and next prime (21234461).

It can be written as a sum of positive squares in 2 ways, for example, as 11587216 + 9647236 = 3404^2 + 3106^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18827 + ... + 19922.

It is an arithmetic number, because the mean of its divisors is an integer number (3119375).

Almost surely, 2^21234452 is an apocalyptic number.

It is an amenable number.

21234452 is a deficient number, since it is larger than the sum of its proper divisors (16198048).

21234452 is a wasteful number, since it uses less digits than its factorization.

21234452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38890 (or 38888 counting only the distinct ones).

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

The square root of 21234452 is about 4608.0855026790. The cubic root of 21234452 is about 276.9153429385.

Adding to 21234452 its reverse (25443212), we get a palindrome (46677664).

The spelling of 21234452 in words is "twenty-one million, two hundred thirty-four thousand, four hundred fifty-two".