121212009977 has 2 divisors, whose sum is σ = 121212009978. Its totient is φ = 121212009976.

The previous prime is 121212009883. The next prime is 121212010013. The reversal of 121212009977 is 779900212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114430652176 + 6781357801 = 338276^2 + 82349^2 .

It is an emirp because it is prime and its reverse (779900212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121212009977 - 2³⁰ = 120138268153 is a prime.

It is not a weakly prime, because it can be changed into another prime (121212006977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606004988 + 60606004989.

It is an arithmetic number, because the mean of its divisors is an integer number (60606004989).

Almost surely, 2^121212009977 is an apocalyptic number.

It is an amenable number.

121212009977 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212009977 is an equidigital number, since it uses as much as digits as its factorization.

121212009977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The spelling of 121212009977 in words is "one hundred twenty-one billion, two hundred twelve million, nine thousand, nine hundred seventy-seven".