21394338 has 16 divisors (see below), whose sum is σ = 48901440. Its totient is φ = 6112656.

The previous prime is 21394337. The next prime is 21394339. The reversal of 21394338 is 83349312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21394337) and next prime (21394339).

It is a junction number, because it is equal to n+sod(n) for n = 21394299 and 21394308.

It is not an unprimeable number, because it can be changed into a prime (21394337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254653 + ... + 254736.

It is an arithmetic number, because the mean of its divisors is an integer number (3056340).

Almost surely, 2^21394338 is an apocalyptic number.

21394338 is an abundant number, since it is smaller than the sum of its proper divisors (27507102).

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

21394338 is a wasteful number, since it uses less digits than its factorization.

21394338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509401.

The product of its digits is 15552, while the sum is 33.

The square root of 21394338 is about 4625.4013879879. The cubic root of 21394338 is about 277.6086223573.

The spelling of 21394338 in words is "twenty-one million, three hundred ninety-four thousand, three hundred thirty-eight".