121003999 has 2 divisors, whose sum is σ = 121004000. Its totient is φ = 121003998.

The previous prime is 121003973. The next prime is 121004041. The reversal of 121003999 is 999300121.

It is a weak prime.

It is an emirp because it is prime and its reverse (999300121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121003999 - 2¹³ = 120995807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121003919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501999 + 60502000.

It is an arithmetic number, because the mean of its divisors is an integer number (60502000).

Almost surely, 2^121003999 is an apocalyptic number.

121003999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121003999 is an equidigital number, since it uses as much as digits as its factorization.

121003999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 121003999 is about 11000.1817712254. The cubic root of 121003999 is about 494.6141931364.

The spelling of 121003999 in words is "one hundred twenty-one million, three thousand, nine hundred ninety-nine".