212220201997 has 2 divisors, whose sum is σ = 212220201998. Its totient is φ = 212220201996.

The previous prime is 212220201989. The next prime is 212220202001. The reversal of 212220201997 is 799102022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190851901956 + 21368300041 = 436866^2 + 146179^2 .

It is a cyclic number.

It is not a de Polignac number, because 212220201997 - 2³ = 212220201989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212220201197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106110100998 + 106110100999.

It is an arithmetic number, because the mean of its divisors is an integer number (106110100999).

Almost surely, 2^212220201997 is an apocalyptic number.

It is an amenable number.

212220201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212220201997 is an equidigital number, since it uses as much as digits as its factorization.

212220201997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 212220201997 in words is "two hundred twelve billion, two hundred twenty million, two hundred one thousand, nine hundred ninety-seven".