221298739769 has 2 divisors, whose sum is σ = 221298739770. Its totient is φ = 221298739768.

The previous prime is 221298739661. The next prime is 221298739787. The reversal of 221298739769 is 967937892122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221263929769 + 34810000 = 470387^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 221298739769 - 2⁸ = 221298739513 is a prime.

It is a super-2 number, since 2×221298739769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221298739469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110649369884 + 110649369885.

It is an arithmetic number, because the mean of its divisors is an integer number (110649369885).

Almost surely, 2^221298739769 is an apocalyptic number.

It is an amenable number.

221298739769 is a deficient number, since it is larger than the sum of its proper divisors (1).

221298739769 is an equidigital number, since it uses as much as digits as its factorization.

221298739769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41150592, while the sum is 65.

The spelling of 221298739769 in words is "two hundred twenty-one billion, two hundred ninety-eight million, seven hundred thirty-nine thousand, seven hundred sixty-nine".