221145355279 has 2 divisors, whose sum is σ = 221145355280. Its totient is φ = 221145355278.

The previous prime is 221145355217. The next prime is 221145355337. The reversal of 221145355279 is 972553541122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221145355279 - 2³³ = 212555420687 is a prime.

It is a super-2 number, since 2×221145355279² (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 (221145155279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110572677639 + 110572677640.

It is an arithmetic number, because the mean of its divisors is an integer number (110572677640).

Almost surely, 2^221145355279 is an apocalyptic number.

221145355279 is a deficient number, since it is larger than the sum of its proper divisors (1).

221145355279 is an equidigital number, since it uses as much as digits as its factorization.

221145355279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756000, while the sum is 46.

The spelling of 221145355279 in words is "two hundred twenty-one billion, one hundred forty-five million, three hundred fifty-five thousand, two hundred seventy-nine".