231221021002120 has 16 divisors (see below), whose sum is σ = 520247297254860. Its totient is φ = 92488408400832.

The previous prime is 231221021002109. The next prime is 231221021002229. The reversal of 231221021002120 is 21200120122132.

It can be written as a sum of positive squares in 2 ways, for example, as 230919692465764 + 301328536356 = 15196042^2 + 548934^2 .

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, 2890262762487 + ... + 2890262762566.

Almost surely, 2^{231221021002120} is an apocalyptic number.

231221021002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231221021002120 is an abundant number, since it is smaller than the sum of its proper divisors (289026276252740).

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

231221021002120 is a wasteful number, since it uses less digits than its factorization.

231221021002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780525525064 (or 5780525525060 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 231221021002120 its reverse (21200120122132), we get a palindrome (252421141124252).

The spelling of 231221021002120 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, twenty-one million, two thousand, one hundred twenty".