210102 has 24 divisors (see below), whose sum is σ = 448056. Its totient is φ = 65664.

The previous prime is 210101. The next prime is 210109. The reversal of 210102 is 201012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101) 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, 2118 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (18669).

2²¹⁰¹⁰² is an apocalyptic number.

210102 is an abundant number, since it is smaller than the sum of its proper divisors (237954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

210102 is a wasteful number, since it uses less digits than its factorization.

210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 210102 is about 458.3688471090. The cubic root of 210102 is about 59.4488414626.

Adding to 210102 its reverse (201012), we get a palindrome (411114).

It can be divided in two parts, 21010 and 2, that added together give a palindrome (21012).

The spelling of 210102 in words is "two hundred ten thousand, one hundred two", and thus it is an iban number.