121979219 has 2 divisors, whose sum is σ = 121979220. Its totient is φ = 121979218.

The previous prime is 121979213. The next prime is 121979243. The reversal of 121979219 is 912979121.

It is a weak prime.

It is an emirp because it is prime and its reverse (912979121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121979219 - 2¹⁶ = 121913683 is a prime.

It is a super-2 number, since 2×121979219² = 29757859735699922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (121979213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60989609 + 60989610.

It is an arithmetic number, because the mean of its divisors is an integer number (60989610).

Almost surely, 2^121979219 is an apocalyptic number.

121979219 is a deficient number, since it is larger than the sum of its proper divisors (1).

121979219 is an equidigital number, since it uses as much as digits as its factorization.

121979219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 41.

The square root of 121979219 is about 11044.4202654553. The cubic root of 121979219 is about 495.9394043972.

The spelling of 121979219 in words is "one hundred twenty-one million, nine hundred seventy-nine thousand, two hundred nineteen".