21311149 has 12 divisors (see below), whose sum is σ = 23262004. Its totient is φ = 19505664.

The previous prime is 21311137. The next prime is 21311161. The reversal of 21311149 is 94111312.

It is an interprime number because it is at equal distance from previous prime (21311137) and next prime (21311161).

It can be written as a sum of positive squares in 6 ways, for example, as 7672900 + 13638249 = 2770^2 + 3693^2 .

It is not a de Polignac number, because 21311149 - 2⁵ = 21311117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9697 + ... + 11689.

Almost surely, 2^21311149 is an apocalyptic number.

It is an amenable number.

21311149 is a deficient number, since it is larger than the sum of its proper divisors (1950855).

21311149 is a wasteful number, since it uses less digits than its factorization.

21311149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064 (or 2047 counting only the distinct ones).

The product of its digits is 216, while the sum is 22.

The square root of 21311149 is about 4616.4000043324. The cubic root of 21311149 is about 277.2483404122.

The spelling of 21311149 in words is "twenty-one million, three hundred eleven thousand, one hundred forty-nine".