119999921 has 2 divisors, whose sum is σ = 119999922. Its totient is φ = 119999920.

The previous prime is 119999899. The next prime is 119999927. The reversal of 119999921 is 129999911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117072400 + 2927521 = 10820^2 + 1711^2 .

It is an emirp because it is prime and its reverse (129999911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 119999921 - 2²⁶ = 52891057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 119999921.

It is not a weakly prime, because it can be changed into another prime (119999927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59999960 + 59999961.

It is an arithmetic number, because the mean of its divisors is an integer number (59999961).

Almost surely, 2^119999921 is an apocalyptic number.

It is an amenable number.

119999921 is a deficient number, since it is larger than the sum of its proper divisors (1).

119999921 is an equidigital number, since it uses as much as digits as its factorization.

119999921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118098, while the sum is 50.

The square root of 119999921 is about 10954.4475442626. The cubic root of 119999921 is about 493.2423066268.

The spelling of 119999921 in words is "one hundred nineteen million, nine hundred ninety-nine thousand, nine hundred twenty-one".