21109044311 has 2 divisors, whose sum is σ = 21109044312. Its totient is φ = 21109044310.

The previous prime is 21109044287. The next prime is 21109044317. The reversal of 21109044311 is 11344090112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21109044311 - 2³⁰ = 20035302487 is a prime.

It is a super-2 number, since 2×21109044311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21109044317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10554522155 + 10554522156.

It is an arithmetic number, because the mean of its divisors is an integer number (10554522156).

Almost surely, 2^21109044311 is an apocalyptic number.

21109044311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21109044311 is an equidigital number, since it uses as much as digits as its factorization.

21109044311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21109044311 in words is "twenty-one billion, one hundred nine million, forty-four thousand, three hundred eleven".