21453412 has 12 divisors (see below), whose sum is σ = 37614780. Its totient is φ = 10706336.

The previous prime is 21453401. The next prime is 21453427. The reversal of 21453412 is 21435412.

It can be written as a sum of positive squares in 2 ways, for example, as 12845056 + 8608356 = 3584^2 + 2934^2 .

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2587 + ... + 7042.

It is an arithmetic number, because the mean of its divisors is an integer number (3134565).

Almost surely, 2^21453412 is an apocalyptic number.

It is an amenable number.

21453412 is a deficient number, since it is larger than the sum of its proper divisors (16161368).

21453412 is a wasteful number, since it uses less digits than its factorization.

21453412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10190 (or 10188 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21453412 is about 4631.7828101067. The cubic root of 21453412 is about 277.8638983221.

Adding to 21453412 its reverse (21435412), we get a palindrome (42888824).

The spelling of 21453412 in words is "twenty-one million, four hundred fifty-three thousand, four hundred twelve".