21374293 has 2 divisors, whose sum is σ = 21374294. Its totient is φ = 21374292.

The previous prime is 21374281. The next prime is 21374299. The reversal of 21374293 is 39247312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18301284 + 3073009 = 4278^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21374293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687146 + 10687147.

It is an arithmetic number, because the mean of its divisors is an integer number (10687147).

Almost surely, 2^21374293 is an apocalyptic number.

It is an amenable number.

21374293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374293 is an equidigital number, since it uses as much as digits as its factorization.

21374293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 21374293 is about 4623.2340412313. The cubic root of 21374293 is about 277.5218953045.

The spelling of 21374293 in words is "twenty-one million, three hundred seventy-four thousand, two hundred ninety-three".