221313631872469 has 2 divisors, whose sum is σ = 221313631872470. Its totient is φ = 221313631872468.

The previous prime is 221313631872449. The next prime is 221313631872493. The reversal of 221313631872469 is 964278136313122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221262798759025 + 50833113444 = 14874905^2 + 225462^2 .

It is a cyclic number.

It is not a de Polignac number, because 221313631872469 - 2¹¹ = 221313631870421 is a prime.

It is a super-2 number, since 2×221313631872469² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221313631872419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110656815936234 + 110656815936235.

It is an arithmetic number, because the mean of its divisors is an integer number (110656815936235).

Almost surely, 2^{221313631872469} is an apocalyptic number.

It is an amenable number.

221313631872469 is a deficient number, since it is larger than the sum of its proper divisors (1).

221313631872469 is an equidigital number, since it uses as much as digits as its factorization.

221313631872469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 58.

The spelling of 221313631872469 in words is "two hundred twenty-one trillion, three hundred thirteen billion, six hundred thirty-one million, eight hundred seventy-two thousand, four hundred sixty-nine".