210020099 has 4 divisors (see below), whose sum is σ = 210218736. Its totient is φ = 209821464.

The previous prime is 210020087. The next prime is 210020101. The reversal of 210020099 is 990020012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210020099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210020039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97724 + ... + 99849.

It is an arithmetic number, because the mean of its divisors is an integer number (52554684).

Almost surely, 2^210020099 is an apocalyptic number.

210020099 is a deficient number, since it is larger than the sum of its proper divisors (198637).

210020099 is a wasteful number, since it uses less digits than its factorization.

210020099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198636.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 210020099 is about 14492.0702109809. The cubic root of 210020099 is about 594.4111576694.

The spelling of 210020099 in words is "two hundred ten million, twenty thousand, ninety-nine".