21074111 has 2 divisors, whose sum is σ = 21074112. Its totient is φ = 21074110.

The previous prime is 21074099. The next prime is 21074117. The reversal of 21074111 is 11147012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21074111 - 2¹⁴ = 21057727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21074111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21074117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10537055 + 10537056.

It is an arithmetic number, because the mean of its divisors is an integer number (10537056).

Almost surely, 2^21074111 is an apocalyptic number.

21074111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21074111 is an equidigital number, since it uses as much as digits as its factorization.

21074111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 21074111 is about 4590.6547463298. The cubic root of 21074111 is about 276.2165868011.

The spelling of 21074111 in words is "twenty-one million, seventy-four thousand, one hundred eleven".