121961727673 has 2 divisors, whose sum is σ = 121961727674. Its totient is φ = 121961727672.

The previous prime is 121961727661. The next prime is 121961727677. The reversal of 121961727673 is 376727169121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106043363449 + 15918364224 = 325643^2 + 126168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121961727673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121961727673.

It is not a weakly prime, because it can be changed into another prime (121961727677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60980863836 + 60980863837.

It is an arithmetic number, because the mean of its divisors is an integer number (60980863837).

Almost surely, 2^121961727673 is an apocalyptic number.

It is an amenable number.

121961727673 is a deficient number, since it is larger than the sum of its proper divisors (1).

121961727673 is an equidigital number, since it uses as much as digits as its factorization.

121961727673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1333584, while the sum is 52.

The spelling of 121961727673 in words is "one hundred twenty-one billion, nine hundred sixty-one million, seven hundred twenty-seven thousand, six hundred seventy-three".