213131220330 has 64 divisors (see below), whose sum is σ = 593313730560. Its totient is φ = 47988604224.

The previous prime is 213131220329. The next prime is 213131220349. The reversal of 213131220330 is 33022131312.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213131220297 and 213131220306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7559890 + ... + 7588029.

It is an arithmetic number, because the mean of its divisors is an integer number (9270527040).

Almost surely, 2^213131220330 is an apocalyptic number.

213131220330 is an abundant number, since it is smaller than the sum of its proper divisors (380182510230).

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

213131220330 is a wasteful number, since it uses less digits than its factorization.

213131220330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15148003.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 213131220330 its reverse (33022131312), we get a palindrome (246153351642).

The spelling of 213131220330 in words is "two hundred thirteen billion, one hundred thirty-one million, two hundred twenty thousand, three hundred thirty".