210999024869 has 2 divisors, whose sum is σ = 210999024870. Its totient is φ = 210999024868.

The previous prime is 210999024857. The next prime is 210999024911. The reversal of 210999024869 is 968420999012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195138645025 + 15860379844 = 441745^2 + 125938^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210999024869 is a prime.

It is a super-2 number, since 2×210999024869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210999024569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105499512434 + 105499512435.

It is an arithmetic number, because the mean of its divisors is an integer number (105499512435).

Almost surely, 2^210999024869 is an apocalyptic number.

It is an amenable number.

210999024869 is a deficient number, since it is larger than the sum of its proper divisors (1).

210999024869 is an equidigital number, since it uses as much as digits as its factorization.

210999024869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The spelling of 210999024869 in words is "two hundred ten billion, nine hundred ninety-nine million, twenty-four thousand, eight hundred sixty-nine".