210123513 has 6 divisors (see below), whose sum is σ = 303511754. Its totient is φ = 140082336.

The previous prime is 210123479. The next prime is 210123521. The reversal of 210123513 is 315321012.

It can be written as a sum of positive squares in only one way, i.e., 107060409 + 103063104 = 10347^2 + 10152^2 .

It is not a de Polignac number, because 210123513 - 2⁶ = 210123449 is a prime.

It is a super-2 number, since 2×210123513² = 88303781430922338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210123523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11673520 + ... + 11673537.

Almost surely, 2^210123513 is an apocalyptic number.

It is an amenable number.

210123513 is a deficient number, since it is larger than the sum of its proper divisors (93388241).

210123513 is a wasteful number, since it uses less digits than its factorization.

210123513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23347063 (or 23347060 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 210123513 is about 14495.6377231221. The cubic root of 210123513 is about 594.5087044425.

Adding to 210123513 its reverse (315321012), we get a palindrome (525444525).

The spelling of 210123513 in words is "two hundred ten million, one hundred twenty-three thousand, five hundred thirteen".