221222040397 has 2 divisors, whose sum is σ = 221222040398. Its totient is φ = 221222040396.

The previous prime is 221222040373. The next prime is 221222040421. The reversal of 221222040397 is 793040222122.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (221222040373) and next prime (221222040421).

It can be written as a sum of positive squares in only one way, i.e., 185710145481 + 35511894916 = 430941^2 + 188446^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222040397 - 2⁷ = 221222040269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222040337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611020198 + 110611020199.

It is an arithmetic number, because the mean of its divisors is an integer number (110611020199).

Almost surely, 2^221222040397 is an apocalyptic number.

It is an amenable number.

221222040397 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222040397 is an equidigital number, since it uses as much as digits as its factorization.

221222040397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 221222040397 in words is "two hundred twenty-one billion, two hundred twenty-two million, forty thousand, three hundred ninety-seven".