21311452 has 6 divisors (see below), whose sum is σ = 37295048. Its totient is φ = 10655724.

The previous prime is 21311447. The next prime is 21311453. The reversal of 21311452 is 25411312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663928 + ... + 2663935.

Almost surely, 2^21311452 is an apocalyptic number.

It is an amenable number.

21311452 is a deficient number, since it is larger than the sum of its proper divisors (15983596).

21311452 is a wasteful number, since it uses less digits than its factorization.

21311452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327867 (or 5327865 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 21311452 is about 4616.4328219958. The cubic root of 21311452 is about 277.2496543699.

Adding to 21311452 its reverse (25411312), we get a palindrome (46722764).

The spelling of 21311452 in words is "twenty-one million, three hundred eleven thousand, four hundred fifty-two".