221545540351 has 2 divisors, whose sum is σ = 221545540352. Its totient is φ = 221545540350.

The previous prime is 221545540327. The next prime is 221545540369. The reversal of 221545540351 is 153045545122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221545540351 - 2¹⁵ = 221545507583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221545540351.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221545540651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110772770175 + 110772770176.

It is an arithmetic number, because the mean of its divisors is an integer number (110772770176).

Almost surely, 2^221545540351 is an apocalyptic number.

221545540351 is a deficient number, since it is larger than the sum of its proper divisors (1).

221545540351 is an equidigital number, since it uses as much as digits as its factorization.

221545540351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 221545540351 in words is "two hundred twenty-one billion, five hundred forty-five million, five hundred forty thousand, three hundred fifty-one".