21294013 has 8 divisors (see below), whose sum is σ = 24281208. Its totient is φ = 18499584.

The previous prime is 21294001. The next prime is 21294029. The reversal of 21294013 is 31049212.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 21132409 = 402^2 + 4597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21294013 - 2¹³ = 21285821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21294913) 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, 47956 + ... + 48397.

It is an arithmetic number, because the mean of its divisors is an integer number (3035151).

Almost surely, 2^21294013 is an apocalyptic number.

It is an amenable number.

21294013 is a deficient number, since it is larger than the sum of its proper divisors (2987195).

21294013 is a wasteful number, since it uses less digits than its factorization.

21294013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96383.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21294013 is about 4614.5436394079. The cubic root of 21294013 is about 277.1740099679.

The spelling of 21294013 in words is "twenty-one million, two hundred ninety-four thousand, thirteen".