21453374 has 4 divisors (see below), whose sum is σ = 32180064. Its totient is φ = 10726686.

The previous prime is 21453353. The next prime is 21453391. The reversal of 21453374 is 47335412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5363342 + ... + 5363345.

It is an arithmetic number, because the mean of its divisors is an integer number (8045016).

Almost surely, 2^21453374 is an apocalyptic number.

21453374 is a deficient number, since it is larger than the sum of its proper divisors (10726690).

21453374 is a wasteful number, since it uses less digits than its factorization.

21453374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10726689.

The product of its digits is 10080, while the sum is 29.

The square root of 21453374 is about 4631.7787080127. The cubic root of 21453374 is about 277.8637342638.

Adding to 21453374 its reverse (47335412), we get a palindrome (68788786).

The spelling of 21453374 in words is "twenty-one million, four hundred fifty-three thousand, three hundred seventy-four".