21894454 has 8 divisors (see below), whose sum is σ = 33729408. Its totient is φ = 10651320.

The previous prime is 21894443. The next prime is 21894493. The reversal of 21894454 is 45449812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

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, 147862 + ... + 148009.

It is an arithmetic number, because the mean of its divisors is an integer number (4216176).

Almost surely, 2^21894454 is an apocalyptic number.

21894454 is a deficient number, since it is larger than the sum of its proper divisors (11834954).

21894454 is a wasteful number, since it uses less digits than its factorization.

21894454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295910.

The product of its digits is 46080, while the sum is 37.

The square root of 21894454 is about 4679.1509913658. The cubic root of 21894454 is about 279.7551175257.

The spelling of 21894454 in words is "twenty-one million, eight hundred ninety-four thousand, four hundred fifty-four".