121009656787 has 2 divisors, whose sum is σ = 121009656788. Its totient is φ = 121009656786.

The previous prime is 121009656767. The next prime is 121009656931. The reversal of 121009656787 is 787656900121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121009656787 is a prime.

It is not a weakly prime, because it can be changed into another prime (121009656727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60504828393 + 60504828394.

It is an arithmetic number, because the mean of its divisors is an integer number (60504828394).

Almost surely, 2^121009656787 is an apocalyptic number.

121009656787 is a deficient number, since it is larger than the sum of its proper divisors (1).

121009656787 is an equidigital number, since it uses as much as digits as its factorization.

121009656787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 121009656787 in words is "one hundred twenty-one billion, nine million, six hundred fifty-six thousand, seven hundred eighty-seven".