21374783 has 2 divisors, whose sum is σ = 21374784. Its totient is φ = 21374782.

The previous prime is 21374767. The next prime is 21374803. The reversal of 21374783 is 38747312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21374783 - 2⁴ = 21374767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21374713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687391 + 10687392.

It is an arithmetic number, because the mean of its divisors is an integer number (10687392).

Almost surely, 2^21374783 is an apocalyptic number.

21374783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374783 is an equidigital number, since it uses as much as digits as its factorization.

21374783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 21374783 is about 4623.2870341349. The cubic root of 21374783 is about 277.5240159936.

The spelling of 21374783 in words is "twenty-one million, three hundred seventy-four thousand, seven hundred eighty-three".