121320231997 has 2 divisors, whose sum is σ = 121320231998. Its totient is φ = 121320231996.

The previous prime is 121320231983. The next prime is 121320232013. The reversal of 121320231997 is 799132023121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120666611641 + 653620356 = 347371^2 + 25566^2 .

It is a cyclic number.

It is not a de Polignac number, because 121320231997 - 2¹¹ = 121320229949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121320231397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660115998 + 60660115999.

It is an arithmetic number, because the mean of its divisors is an integer number (60660115999).

Almost surely, 2^121320231997 is an apocalyptic number.

It is an amenable number.

121320231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121320231997 is an equidigital number, since it uses as much as digits as its factorization.

121320231997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The spelling of 121320231997 in words is "one hundred twenty-one billion, three hundred twenty million, two hundred thirty-one thousand, nine hundred ninety-seven".