321212221997 has 2 divisors, whose sum is σ = 321212221998. Its totient is φ = 321212221996.

The previous prime is 321212221943. The next prime is 321212222063. The reversal of 321212221997 is 799122212123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252676123561 + 68536098436 = 502669^2 + 261794^2 .

It is a cyclic number.

It is not a de Polignac number, because 321212221997 - 2¹² = 321212217901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321212221927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606110998 + 160606110999.

It is an arithmetic number, because the mean of its divisors is an integer number (160606110999).

Almost surely, 2^321212221997 is an apocalyptic number.

It is an amenable number.

321212221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

321212221997 is an equidigital number, since it uses as much as digits as its factorization.

321212221997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The spelling of 321212221997 in words is "three hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, nine hundred ninety-seven".