213120231220 has 48 divisors (see below), whose sum is σ = 493735224528. Its totient is φ = 76771261440.

The previous prime is 213120231031. The next prime is 213120231227. The reversal of 213120231220 is 22132021312.

It can be written as a sum of positive squares in 8 ways, for example, as 13613288976 + 199506942244 = 116676^2 + 446662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213120231227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9985599 + ... + 10006918.

It is an arithmetic number, because the mean of its divisors is an integer number (10286150511).

Almost surely, 2^213120231220 is an apocalyptic number.

213120231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213120231220 is an abundant number, since it is smaller than the sum of its proper divisors (280614993308).

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

213120231220 is a wasteful number, since it uses less digits than its factorization.

213120231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19992580 (or 19992578 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 213120231220 its reverse (22132021312), we get a palindrome (235252252532).

The spelling of 213120231220 in words is "two hundred thirteen billion, one hundred twenty million, two hundred thirty-one thousand, two hundred twenty".