213231012121220 has 12 divisors (see below), whose sum is σ = 447785125454604. Its totient is φ = 85292404848480.

The previous prime is 213231012121219. The next prime is 213231012121271. The reversal of 213231012121220 is 22121210132312.

It can be written as a sum of positive squares in 2 ways, for example, as 47502310564864 + 165728701556356 = 6892192^2 + 12873566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5330775303011 + ... + 5330775303050.

It is an arithmetic number, because the mean of its divisors is an integer number (37315427121217).

Almost surely, 2^{213231012121220} is an apocalyptic number.

213231012121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213231012121220 is an abundant number, since it is smaller than the sum of its proper divisors (234554113333384).

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

213231012121220 is a wasteful number, since it uses less digits than its factorization.

213231012121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10661550606070 (or 10661550606068 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 213231012121220 its reverse (22121210132312), we get a palindrome (235352222253532).

The spelling of 213231012121220 in words is "two hundred thirteen trillion, two hundred thirty-one billion, twelve million, one hundred twenty-one thousand, two hundred twenty".