21111760867 has 2 divisors, whose sum is σ = 21111760868. Its totient is φ = 21111760866.

The previous prime is 21111760861. The next prime is 21111760919. The reversal of 21111760867 is 76806711112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111760867 - 2⁷ = 21111760739 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111760861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555880433 + 10555880434.

It is an arithmetic number, because the mean of its divisors is an integer number (10555880434).

Almost surely, 2^21111760867 is an apocalyptic number.

21111760867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111760867 is an equidigital number, since it uses as much as digits as its factorization.

21111760867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 21111760867 in words is "twenty-one billion, one hundred eleven million, seven hundred sixty thousand, eight hundred sixty-seven".