21364454 has 4 divisors (see below), whose sum is σ = 32046684. Its totient is φ = 10682226.

The previous prime is 21364451. The next prime is 21364463. The reversal of 21364454 is 45446312.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5341112 + ... + 5341115.

It is an arithmetic number, because the mean of its divisors is an integer number (8011671).

Almost surely, 2^21364454 is an apocalyptic number.

21364454 is a deficient number, since it is larger than the sum of its proper divisors (10682230).

21364454 is a wasteful number, since it uses less digits than its factorization.

21364454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10682229.

The product of its digits is 11520, while the sum is 29.

The square root of 21364454 is about 4622.1698367758. The cubic root of 21364454 is about 277.4793058723.

The spelling of 21364454 in words is "twenty-one million, three hundred sixty-four thousand, four hundred fifty-four".