21674047 has 2 divisors, whose sum is σ = 21674048. Its totient is φ = 21674046.

The previous prime is 21674033. The next prime is 21674057. The reversal of 21674047 is 74047612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21674047 - 2¹¹ = 21671999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21674057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837023 + 10837024.

It is an arithmetic number, because the mean of its divisors is an integer number (10837024).

Almost surely, 2^21674047 is an apocalyptic number.

21674047 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674047 is an equidigital number, since it uses as much as digits as its factorization.

21674047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 21674047 is about 4655.5393887282. The cubic root of 21674047 is about 278.8132038439.

The spelling of 21674047 in words is "twenty-one million, six hundred seventy-four thousand, forty-seven".