21114445 has 16 divisors (see below), whose sum is σ = 27739008. Its totient is φ = 15301440.

The previous prime is 21114439. The next prime is 21114451. The reversal of 21114445 is 54441112.

It is an interprime number because it is at equal distance from previous prime (21114439) and next prime (21114451).

It is not a de Polignac number, because 21114445 - 2⁹ = 21113933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21352 + ... + 22318.

It is an arithmetic number, because the mean of its divisors is an integer number (1733688).

Almost surely, 2^21114445 is an apocalyptic number.

It is an amenable number.

21114445 is a deficient number, since it is larger than the sum of its proper divisors (6624563).

21114445 is a wasteful number, since it uses less digits than its factorization.

21114445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380.

The product of its digits is 640, while the sum is 22.

The square root of 21114445 is about 4595.0457016226. The cubic root of 21114445 is about 276.3926926051.

Adding to 21114445 its reverse (54441112), we get a palindrome (75555557).

It can be divided in two parts, 2111 and 4445, that added together give a palindrome (6556).

The spelling of 21114445 in words is "twenty-one million, one hundred fourteen thousand, four hundred forty-five".