121121001997 has 2 divisors, whose sum is σ = 121121001998. Its totient is φ = 121121001996.

The previous prime is 121121001961. The next prime is 121121002003. The reversal of 121121001997 is 799100121121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93549727881 + 27571274116 = 305859^2 + 166046^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121121001997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121121001797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560500998 + 60560500999.

It is an arithmetic number, because the mean of its divisors is an integer number (60560500999).

Almost surely, 2^121121001997 is an apocalyptic number.

It is an amenable number.

121121001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121001997 is an equidigital number, since it uses as much as digits as its factorization.

121121001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 34.

The spelling of 121121001997 in words is "one hundred twenty-one billion, one hundred twenty-one million, one thousand, nine hundred ninety-seven".