21373327 has 2 divisors, whose sum is σ = 21373328. Its totient is φ = 21373326.

The previous prime is 21373277. The next prime is 21373333. The reversal of 21373327 is 72337312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21373327 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21373295 and 21373304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21373337) 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, 10686663 + 10686664.

It is an arithmetic number, because the mean of its divisors is an integer number (10686664).

Almost surely, 2^21373327 is an apocalyptic number.

21373327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373327 is an equidigital number, since it uses as much as digits as its factorization.

21373327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 28.

The square root of 21373327 is about 4623.1295677279. The cubic root of 21373327 is about 277.5177144226.

The spelling of 21373327 in words is "twenty-one million, three hundred seventy-three thousand, three hundred twenty-seven".