210121199 has 2 divisors, whose sum is σ = 210121200. Its totient is φ = 210121198.

The previous prime is 210121159. The next prime is 210121217. The reversal of 210121199 is 991121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210121199 - 2¹⁶ = 210055663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060599 + 105060600.

It is an arithmetic number, because the mean of its divisors is an integer number (105060600).

Almost surely, 2^210121199 is an apocalyptic number.

210121199 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121199 is an equidigital number, since it uses as much as digits as its factorization.

210121199 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 26.

The square root of 210121199 is about 14495.5579057862. The cubic root of 210121199 is about 594.5065220782.

The spelling of 210121199 in words is "two hundred ten million, one hundred twenty-one thousand, one hundred ninety-nine".