21380294 has 16 divisors (see below), whose sum is σ = 36040032. Its totient is φ = 9438528.

The previous prime is 21380273. The next prime is 21380299. The reversal of 21380294 is 49208312.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21380299) 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, 17279 + ... + 18474.

It is an arithmetic number, because the mean of its divisors is an integer number (2252502).

Almost surely, 2^21380294 is an apocalyptic number.

21380294 is a deficient number, since it is larger than the sum of its proper divisors (14659738).

21380294 is a wasteful number, since it uses less digits than its factorization.

21380294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35791.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21380294 is about 4623.8830002499. The cubic root of 21380294 is about 277.5478650221.

The spelling of 21380294 in words is "twenty-one million, three hundred eighty thousand, two hundred ninety-four".