21199122869 has 2 divisors, whose sum is σ = 21199122870. Its totient is φ = 21199122868.

The previous prime is 21199122827. The next prime is 21199122887. The reversal of 21199122869 is 96822199112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20906268100 + 292854769 = 144590^2 + 17113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21199122869 is a prime.

It is a super-2 number, since 2×21199122869² (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 (21199122809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10599561434 + 10599561435.

It is an arithmetic number, because the mean of its divisors is an integer number (10599561435).

Almost surely, 2^21199122869 is an apocalyptic number.

It is an amenable number.

21199122869 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199122869 is an equidigital number, since it uses as much as digits as its factorization.

21199122869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 50.

The spelling of 21199122869 in words is "twenty-one billion, one hundred ninety-nine million, one hundred twenty-two thousand, eight hundred sixty-nine".