21112220069 has 2 divisors, whose sum is σ = 21112220070. Its totient is φ = 21112220068.

The previous prime is 21112220057. The next prime is 21112220113. The reversal of 21112220069 is 96002221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11729973025 + 9382247044 = 108305^2 + 96862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112220069 is a prime.

It is a super-2 number, since 2×21112220069² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112220029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556110034 + 10556110035.

It is an arithmetic number, because the mean of its divisors is an integer number (10556110035).

Almost surely, 2^21112220069 is an apocalyptic number.

It is an amenable number.

21112220069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112220069 is an equidigital number, since it uses as much as digits as its factorization.

21112220069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21112220069 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, sixty-nine".