21012200111069 has 2 divisors, whose sum is σ = 21012200111070. Its totient is φ = 21012200111068.

The previous prime is 21012200111059. The next prime is 21012200111101. The reversal of 21012200111069 is 96011100221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20037709322500 + 974490788569 = 4476350^2 + 987163^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012200111069 - 2⁸ = 21012200110813 is a prime.

It is a super-2 number, since 2×21012200111069² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012200111059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506100055534 + 10506100055535.

It is an arithmetic number, because the mean of its divisors is an integer number (10506100055535).

Almost surely, 2^{21012200111069} is an apocalyptic number.

It is an amenable number.

21012200111069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012200111069 is an equidigital number, since it uses as much as digits as its factorization.

21012200111069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 21012200111069 in words is "twenty-one trillion, twelve billion, two hundred million, one hundred eleven thousand, sixty-nine".