21294338 has 18 divisors (see below), whose sum is σ = 34725897. Its totient is φ = 9789000.

The previous prime is 21294289. The next prime is 21294341. The reversal of 21294338 is 83349212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18207289 + 3087049 = 4267^2 + 1757^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3263.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 84713 + ... + 84963.

Almost surely, 2^21294338 is an apocalyptic number.

21294338 is a deficient number, since it is larger than the sum of its proper divisors (13431559).

21294338 is an equidigital number, since it uses as much as digits as its factorization.

21294338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 266 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 21294338 is about 4614.5788540234. The cubic root of 21294338 is about 277.1754200841.

Multiplying 21294338 by its sum of digits (32), we get a square (681418816 = 26104²).

Multiplying 21294338 by its product of digits (10368), we get a square (220779696384 = 469872²).

The spelling of 21294338 in words is "twenty-one million, two hundred ninety-four thousand, three hundred thirty-eight".