21141049 has 4 divisors (see below), whose sum is σ = 21157236. Its totient is φ = 21124864.

The previous prime is 21141041. The next prime is 21141061. The reversal of 21141049 is 94014112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14197824 + 6943225 = 3768^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141049 - 2³ = 21141041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5944 + ... + 8809.

It is an arithmetic number, because the mean of its divisors is an integer number (5289309).

Almost surely, 2^21141049 is an apocalyptic number.

It is an amenable number.

21141049 is a deficient number, since it is larger than the sum of its proper divisors (16187).

21141049 is a wasteful number, since it uses less digits than its factorization.

21141049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16186.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21141049 is about 4597.9396472768. The cubic root of 21141049 is about 276.5087279394.

The spelling of 21141049 in words is "twenty-one million, one hundred forty-one thousand, forty-nine".