321212217901 has 2 divisors, whose sum is σ = 321212217902. Its totient is φ = 321212217900.

The previous prime is 321212217883. The next prime is 321212217913. The reversal of 321212217901 is 109712212123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314816377225 + 6395840676 = 561085^2 + 79974^2 .

It is a cyclic number.

It is not a de Polignac number, because 321212217901 - 2⁷ = 321212217773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321212217941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160606108950 + 160606108951.

It is an arithmetic number, because the mean of its divisors is an integer number (160606108951).

Almost surely, 2^321212217901 is an apocalyptic number.

It is an amenable number.

321212217901 is a deficient number, since it is larger than the sum of its proper divisors (1).

321212217901 is an equidigital number, since it uses as much as digits as its factorization.

321212217901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 321212217901 in words is "three hundred twenty-one billion, two hundred twelve million, two hundred seventeen thousand, nine hundred one".