121720763 has 2 divisors, whose sum is σ = 121720764. Its totient is φ = 121720762.

The previous prime is 121720747. The next prime is 121720769. The reversal of 121720763 is 367027121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121720763 - 2⁴ = 121720747 is a prime.

It is not a weakly prime, because it can be changed into another prime (121720769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60860381 + 60860382.

It is an arithmetic number, because the mean of its divisors is an integer number (60860382).

Almost surely, 2^121720763 is an apocalyptic number.

121720763 is a deficient number, since it is larger than the sum of its proper divisors (1).

121720763 is an equidigital number, since it uses as much as digits as its factorization.

121720763 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 121720763 is about 11032.7133108769. The cubic root of 121720763 is about 495.5888825271.

Adding to 121720763 its reverse (367027121), we get a palindrome (488747884).

The spelling of 121720763 in words is "one hundred twenty-one million, seven hundred twenty thousand, seven hundred sixty-three".