221143912357 has 2 divisors, whose sum is σ = 221143912358. Its totient is φ = 221143912356.

The previous prime is 221143912337. The next prime is 221143912391. The reversal of 221143912357 is 753219341122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213006248676 + 8137663681 = 461526^2 + 90209^2 .

It is a cyclic number.

It is not a de Polignac number, because 221143912357 - 2¹⁹ = 221143388069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221143912337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571956178 + 110571956179.

It is an arithmetic number, because the mean of its divisors is an integer number (110571956179).

Almost surely, 2^221143912357 is an apocalyptic number.

It is an amenable number.

221143912357 is a deficient number, since it is larger than the sum of its proper divisors (1).

221143912357 is an equidigital number, since it uses as much as digits as its factorization.

221143912357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The spelling of 221143912357 in words is "two hundred twenty-one billion, one hundred forty-three million, nine hundred twelve thousand, three hundred fifty-seven".