21394484 has 6 divisors (see below), whose sum is σ = 37440354. Its totient is φ = 10697240.

The previous prime is 21394459. The next prime is 21394519. The reversal of 21394484 is 48449312.

It can be written as a sum of positive squares in only one way, i.e., 19114384 + 2280100 = 4372^2 + 1510^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2674307 + ... + 2674314.

It is an arithmetic number, because the mean of its divisors is an integer number (6240059).

Almost surely, 2^21394484 is an apocalyptic number.

It is an amenable number.

21394484 is a deficient number, since it is larger than the sum of its proper divisors (16045870).

21394484 is a wasteful number, since it uses less digits than its factorization.

21394484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5348625 (or 5348623 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 21394484 is about 4625.4171703750. The cubic root of 21394484 is about 277.6092538447.

The spelling of 21394484 in words is "twenty-one million, three hundred ninety-four thousand, four hundred eighty-four".