21611121344126 has 4 divisors (see below), whose sum is σ = 32416682016192. Its totient is φ = 10805560672062.

The previous prime is 21611121344123. The next prime is 21611121344177. The reversal of 21611121344126 is 62144312111612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611121344123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5402780336030 + ... + 5402780336033.

It is an arithmetic number, because the mean of its divisors is an integer number (8104170504048).

Almost surely, 2^{21611121344126} is an apocalyptic number.

21611121344126 is a deficient number, since it is larger than the sum of its proper divisors (10805560672066).

21611121344126 is a wasteful number, since it uses less digits than its factorization.

21611121344126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10805560672065.

The product of its digits is 13824, while the sum is 35.

Adding to 21611121344126 its reverse (62144312111612), we get a palindrome (83755433455738).

The spelling of 21611121344126 in words is "twenty-one trillion, six hundred eleven billion, one hundred twenty-one million, three hundred forty-four thousand, one hundred twenty-six".