21485111 has 2 divisors, whose sum is σ = 21485112. Its totient is φ = 21485110.

The previous prime is 21485089. The next prime is 21485117. The reversal of 21485111 is 11158412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21485111 - 2⁶ = 21485047 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 (21485117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742555 + 10742556.

It is an arithmetic number, because the mean of its divisors is an integer number (10742556).

Almost surely, 2^21485111 is an apocalyptic number.

21485111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485111 is an equidigital number, since it uses as much as digits as its factorization.

21485111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 23.

The square root of 21485111 is about 4635.2034475306. The cubic root of 21485111 is about 278.0006857806. Note that the first 3 decimals are identical.

The spelling of 21485111 in words is "twenty-one million, four hundred eighty-five thousand, one hundred eleven".