21394373 has 48 divisors (see below), whose sum is σ = 30387840. Its totient is φ = 14636160.

The previous prime is 21394369. The next prime is 21394379. The reversal of 21394373 is 37349312.

It is not a de Polignac number, because 21394373 - 2² = 21394369 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21394379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 319286 + ... + 319352.

It is an arithmetic number, because the mean of its divisors is an integer number (633080).

Almost surely, 2^21394373 is an apocalyptic number.

It is an amenable number.

21394373 is a deficient number, since it is larger than the sum of its proper divisors (8993467).

21394373 is a wasteful number, since it uses less digits than its factorization.

21394373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 127 counting only the distinct ones).

The product of its digits is 13608, while the sum is 32.

The square root of 21394373 is about 4625.4051714417. The cubic root of 21394373 is about 277.6087737415.

The spelling of 21394373 in words is "twenty-one million, three hundred ninety-four thousand, three hundred seventy-three".