213123102 has 16 divisors (see below), whose sum is σ = 427870080. Its totient is φ = 70770392.

The previous prime is 213123077. The next prime is 213123103. The reversal of 213123102 is 201321312.

It is a super-2 number, since 2×213123102² = 90842913212204808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213123103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65952 + ... + 69107.

It is an arithmetic number, because the mean of its divisors is an integer number (26741880).

Almost surely, 2^213123102 is an apocalyptic number.

213123102 is an abundant number, since it is smaller than the sum of its proper divisors (214746978).

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

213123102 is a wasteful number, since it uses less digits than its factorization.

213123102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135327.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 213123102 is about 14598.7363151747. The cubic root of 213123102 is about 597.3242909280.

Adding to 213123102 its reverse (201321312), we get a palindrome (414444414).

The spelling of 213123102 in words is "two hundred thirteen million, one hundred twenty-three thousand, one hundred two".