1020121099 has 2 divisors, whose sum is σ = 1020121100. Its totient is φ = 1020121098.

The previous prime is 1020121097. The next prime is 1020121111. The reversal of 1020121099 is 9901210201.

1020121099 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020121099 - 2¹ = 1020121097 is a prime.

Together with 1020121097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1020121097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060549 + 510060550.

It is an arithmetic number, because the mean of its divisors is an integer number (510060550).

Almost surely, 2^1020121099 is an apocalyptic number.

1020121099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121099 is an equidigital number, since it uses as much as digits as its factorization.

1020121099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1020121099 is about 31939.3346674598. The cubic root of 1020121099 is about 1006.6625449129.

The spelling of 1020121099 in words is "one billion, twenty million, one hundred twenty-one thousand, ninety-nine".