121019999 has 2 divisors, whose sum is σ = 121020000. Its totient is φ = 121019998.

The previous prime is 121019993. The next prime is 121020019. The reversal of 121019999 is 999910121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121019999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121019993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60509999 + 60510000.

It is an arithmetic number, because the mean of its divisors is an integer number (60510000).

Almost surely, 2^121019999 is an apocalyptic number.

121019999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121019999 is an equidigital number, since it uses as much as digits as its factorization.

121019999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 41.

The square root of 121019999 is about 11000.9090078957. The cubic root of 121019999 is about 494.6359926316.

The spelling of 121019999 in words is "one hundred twenty-one million, nineteen thousand, nine hundred ninety-nine".