210299503909 has 12 divisors (see below), whose sum is σ = 231373660140. Its totient is φ = 191001060800.

The previous prime is 210299503877. The next prime is 210299503927. The reversal of 210299503909 is 909305992012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 150520720900 + 59778783009 = 387970^2 + 244497^2 .

It is not a de Polignac number, because 210299503909 - 2⁵ = 210299503877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210299503009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 690664 + ... + 947425.

It is an arithmetic number, because the mean of its divisors is an integer number (19281138345).

Almost surely, 2^210299503909 is an apocalyptic number.

It is an amenable number.

210299503909 is a deficient number, since it is larger than the sum of its proper divisors (21074156231).

210299503909 is a wasteful number, since it uses less digits than its factorization.

210299503909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639172 (or 1639161 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 49.

The spelling of 210299503909 in words is "two hundred ten billion, two hundred ninety-nine million, five hundred three thousand, nine hundred nine".