21111230291 has 2 divisors, whose sum is σ = 21111230292. Its totient is φ = 21111230290.

The previous prime is 21111230281. The next prime is 21111230339. The reversal of 21111230291 is 19203211112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111230291 - 2³⁰ = 20037488467 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111230251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555615145 + 10555615146.

It is an arithmetic number, because the mean of its divisors is an integer number (10555615146).

Almost surely, 2^21111230291 is an apocalyptic number.

21111230291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111230291 is an equidigital number, since it uses as much as digits as its factorization.

21111230291 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21111230291 in words is "twenty-one billion, one hundred eleven million, two hundred thirty thousand, two hundred ninety-one".