21041139 has 12 divisors (see below), whose sum is σ = 32635464. Its totient is φ = 12023424.

The previous prime is 21041117. The next prime is 21041191. The reversal of 21041139 is 93114012.

It is not a de Polignac number, because 21041139 - 2⁵ = 21041107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21041239) 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, 71422 + ... + 71715.

It is an arithmetic number, because the mean of its divisors is an integer number (2719622).

Almost surely, 2^21041139 is an apocalyptic number.

21041139 is a deficient number, since it is larger than the sum of its proper divisors (11594325).

21041139 is a wasteful number, since it uses less digits than its factorization.

21041139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143154 (or 143147 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21041139 is about 4587.0621316917. The cubic root of 21041139 is about 276.0724578717.

The spelling of 21041139 in words is "twenty-one million, forty-one thousand, one hundred thirty-nine".