21674911 has 2 divisors, whose sum is σ = 21674912. Its totient is φ = 21674910.

The previous prime is 21674899. The next prime is 21674923. The reversal of 21674911 is 11947612.

It is a balanced prime because it is at equal distance from previous prime (21674899) and next prime (21674923).

It is a cyclic number.

It is not a de Polignac number, because 21674911 - 2⁹ = 21674399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21674981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837455 + 10837456.

It is an arithmetic number, because the mean of its divisors is an integer number (10837456).

Almost surely, 2^21674911 is an apocalyptic number.

21674911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674911 is an equidigital number, since it uses as much as digits as its factorization.

21674911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 21674911 is about 4655.6321804885. The cubic root of 21674911 is about 278.8169086036.

The spelling of 21674911 in words is "twenty-one million, six hundred seventy-four thousand, nine hundred eleven".