21611126 has 4 divisors (see below), whose sum is σ = 32416692. Its totient is φ = 10805562.

The previous prime is 21611087. The next prime is 21611143. The reversal of 21611126 is 62111612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21611098 and 21611107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402780 + ... + 5402783.

It is an arithmetic number, because the mean of its divisors is an integer number (8104173).

Almost surely, 2^21611126 is an apocalyptic number.

21611126 is a deficient number, since it is larger than the sum of its proper divisors (10805566).

21611126 is a wasteful number, since it uses less digits than its factorization.

21611126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805565.

The product of its digits is 144, while the sum is 20.

The square root of 21611126 is about 4648.7768283711. The cubic root of 21611126 is about 278.5431387696.

Adding to 21611126 its reverse (62111612), we get a palindrome (83722738).

The spelling of 21611126 in words is "twenty-one million, six hundred eleven thousand, one hundred twenty-six".