213123402 has 24 divisors (see below), whose sum is σ = 462047040. Its totient is φ = 70998120.

The previous prime is 213123401. The next prime is 213123439. The reversal of 213123402 is 204321312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (213123401) 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, 44127 + ... + 48717.

It is an arithmetic number, because the mean of its divisors is an integer number (19251960).

Almost surely, 2^213123402 is an apocalyptic number.

213123402 is an abundant number, since it is smaller than the sum of its proper divisors (248923638).

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

213123402 is a wasteful number, since it uses less digits than its factorization.

213123402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7178 (or 7175 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213123402 is about 14598.7465900330. The cubic root of 213123402 is about 597.3245711998.

Adding to 213123402 its reverse (204321312), we get a palindrome (417444714).

The spelling of 213123402 in words is "two hundred thirteen million, one hundred twenty-three thousand, four hundred two".