21344394 has 16 divisors (see below), whose sum is σ = 42937632. Its totient is φ = 7073328.

The previous prime is 21344369. The next prime is 21344417. The reversal of 21344394 is 49344312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9244 + ... + 11319.

It is an arithmetic number, because the mean of its divisors is an integer number (2683602).

Almost surely, 2^21344394 is an apocalyptic number.

21344394 is an abundant number, since it is smaller than the sum of its proper divisors (21593238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344394 is a wasteful number, since it uses less digits than its factorization.

21344394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20741.

The product of its digits is 10368, while the sum is 30.

The square root of 21344394 is about 4619.9993506493. Note that the first 3 decimals coincide. The cubic root of 21344394 is about 277.3924329461.

The spelling of 21344394 in words is "twenty-one million, three hundred forty-four thousand, three hundred ninety-four".