21111100343 has 2 divisors, whose sum is σ = 21111100344. Its totient is φ = 21111100342.

The previous prime is 21111100289. The next prime is 21111100349. The reversal of 21111100343 is 34300111112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111100343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111100349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555550171 + 10555550172.

It is an arithmetic number, because the mean of its divisors is an integer number (10555550172).

Almost surely, 2^21111100343 is an apocalyptic number.

21111100343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111100343 is an equidigital number, since it uses as much as digits as its factorization.

21111100343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111100343 its reverse (34300111112), we get a palindrome (55411211455).

The spelling of 21111100343 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, three hundred forty-three".