213231120020 has 48 divisors (see below), whose sum is σ = 482161740480. Its totient is φ = 78914640384.

The previous prime is 213231120001. The next prime is 213231120061. The reversal of 213231120020 is 20021132312.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5294774 + ... + 5334893.

It is an arithmetic number, because the mean of its divisors is an integer number (10045036260).

Almost surely, 2^213231120020 is an apocalyptic number.

213231120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231120020 is an abundant number, since it is smaller than the sum of its proper divisors (268930620460).

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

213231120020 is a wasteful number, since it uses less digits than its factorization.

213231120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10629752 (or 10629750 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 213231120020 its reverse (20021132312), we get a palindrome (233252252332).

The spelling of 213231120020 in words is "two hundred thirteen billion, two hundred thirty-one million, one hundred twenty thousand, twenty".