2231221210997 has 2 divisors, whose sum is σ = 2231221210998. Its totient is φ = 2231221210996.

The previous prime is 2231221210919. The next prime is 2231221211041. The reversal of 2231221210997 is 7990121221322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1662967572721 + 568253638276 = 1289561^2 + 753826^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231221210997 - 2³² = 2226926243701 is a prime.

It is a super-3 number, since 3×2231221210997³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231221210397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115610605498 + 1115610605499.

It is an arithmetic number, because the mean of its divisors is an integer number (1115610605499).

Almost surely, 2^{2231221210997} is an apocalyptic number.

It is an amenable number.

2231221210997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231221210997 is an equidigital number, since it uses as much as digits as its factorization.

2231221210997 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 2231221210997 in words is "two trillion, two hundred thirty-one billion, two hundred twenty-one million, two hundred ten thousand, nine hundred ninety-seven".