1212220210979 has 2 divisors, whose sum is σ = 1212220210980. Its totient is φ = 1212220210978.

The previous prime is 1212220210909. The next prime is 1212220210991. The reversal of 1212220210979 is 9790120222121.

It is a strong prime.

It is an emirp because it is prime and its reverse (9790120222121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220210979 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1212220210909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110105489 + 606110105490.

It is an arithmetic number, because the mean of its divisors is an integer number (606110105490).

Almost surely, 2^{1212220210979} is an apocalyptic number.

1212220210979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220210979 is an equidigital number, since it uses as much as digits as its factorization.

1212220210979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 1212220210979 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred ten thousand, nine hundred seventy-nine".