216122511373 has 2 divisors, whose sum is σ = 216122511374. Its totient is φ = 216122511372.

The previous prime is 216122511313. The next prime is 216122511379. The reversal of 216122511373 is 373115221612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184695376644 + 31427134729 = 429762^2 + 177277^2 .

It is a cyclic number.

It is not a de Polignac number, because 216122511373 - 2²⁹ = 215585640461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216122511379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108061255686 + 108061255687.

It is an arithmetic number, because the mean of its divisors is an integer number (108061255687).

Almost surely, 2^216122511373 is an apocalyptic number.

It is an amenable number.

216122511373 is a deficient number, since it is larger than the sum of its proper divisors (1).

216122511373 is an equidigital number, since it uses as much as digits as its factorization.

216122511373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

Adding to 216122511373 its reverse (373115221612), we get a palindrome (589237732985).

The spelling of 216122511373 in words is "two hundred sixteen billion, one hundred twenty-two million, five hundred eleven thousand, three hundred seventy-three".