221506355243 has 2 divisors, whose sum is σ = 221506355244. Its totient is φ = 221506355242.

The previous prime is 221506355219. The next prime is 221506355261. The reversal of 221506355243 is 342553605122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221506355243 - 2⁸ = 221506354987 is a prime.

It is a super-2 number, since 2×221506355243² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221506355197 and 221506355206.

It is not a weakly prime, because it can be changed into another prime (221506355743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110753177621 + 110753177622.

It is an arithmetic number, because the mean of its divisors is an integer number (110753177622).

Almost surely, 2^221506355243 is an apocalyptic number.

221506355243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221506355243 is an equidigital number, since it uses as much as digits as its factorization.

221506355243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 38.

The spelling of 221506355243 in words is "two hundred twenty-one billion, five hundred six million, three hundred fifty-five thousand, two hundred forty-three".