21119261 has 4 divisors (see below), whose sum is σ = 21236124. Its totient is φ = 21002400.

The previous prime is 21119257. The next prime is 21119269. The reversal of 21119261 is 16291112.

It is a happy number.

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 10432900 + 10686361 = 3230^2 + 3269^2 .

It is a cyclic number.

It is not a de Polignac number, because 21119261 - 2² = 21119257 is a prime.

It is a super-2 number, since 2×21119261² = 892046370372242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58160 + ... + 58521.

It is an arithmetic number, because the mean of its divisors is an integer number (5309031).

Almost surely, 2^21119261 is an apocalyptic number.

It is an amenable number.

21119261 is a deficient number, since it is larger than the sum of its proper divisors (116863).

21119261 is a wasteful number, since it uses less digits than its factorization.

21119261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116862.

The product of its digits is 216, while the sum is 23.

The square root of 21119261 is about 4595.5697144097. The cubic root of 21119261 is about 276.4137051712.

The spelling of 21119261 in words is "twenty-one million, one hundred nineteen thousand, two hundred sixty-one".