221853377489 has 2 divisors, whose sum is σ = 221853377490. Its totient is φ = 221853377488.

The previous prime is 221853377477. The next prime is 221853377491. The reversal of 221853377489 is 984773358122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154219573264 + 67633804225 = 392708^2 + 260065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221853377489 is a prime.

It is a super-3 number, since 3×221853377489³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 221853377491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221853371489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110926688744 + 110926688745.

It is an arithmetic number, because the mean of its divisors is an integer number (110926688745).

Almost surely, 2^221853377489 is an apocalyptic number.

It is an amenable number.

221853377489 is a deficient number, since it is larger than the sum of its proper divisors (1).

221853377489 is an equidigital number, since it uses as much as digits as its factorization.

221853377489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The spelling of 221853377489 in words is "two hundred twenty-one billion, eight hundred fifty-three million, three hundred seventy-seven thousand, four hundred eighty-nine".