221321222357 has 2 divisors, whose sum is σ = 221321222358. Its totient is φ = 221321222356.

The previous prime is 221321222303. The next prime is 221321222393. The reversal of 221321222357 is 753222123122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194199743761 + 27121478596 = 440681^2 + 164686^2 .

It is a cyclic number.

It is not a de Polignac number, because 221321222357 - 2¹⁸ = 221320960213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221321224357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110660611178 + 110660611179.

It is an arithmetic number, because the mean of its divisors is an integer number (110660611179).

Almost surely, 2^221321222357 is an apocalyptic number.

It is an amenable number.

221321222357 is a deficient number, since it is larger than the sum of its proper divisors (1).

221321222357 is an equidigital number, since it uses as much as digits as its factorization.

221321222357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

Adding to 221321222357 its reverse (753222123122), we get a palindrome (974543345479).

The spelling of 221321222357 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-two thousand, three hundred fifty-seven".