21111023299 has 2 divisors, whose sum is σ = 21111023300. Its totient is φ = 21111023298.

The previous prime is 21111023293. The next prime is 21111023327. The reversal of 21111023299 is 99232011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111023299 - 2¹¹ = 21111021251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111023299.

It is not a weakly prime, because it can be changed into another prime (21111023293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555511649 + 10555511650.

It is an arithmetic number, because the mean of its divisors is an integer number (10555511650).

Almost surely, 2^21111023299 is an apocalyptic number.

21111023299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111023299 is an equidigital number, since it uses as much as digits as its factorization.

21111023299 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21111023299 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, two hundred ninety-nine".