231120221202 has 72 divisors (see below), whose sum is σ = 545412304164. Its totient is φ = 70314317568.

The previous prime is 231120221191. The next prime is 231120221207. The reversal of 231120221202 is 202122021132.

231120221202 is a `hidden beast` number, since 231 + 12 + 0 + 221 + 202 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2597023521 + 228523197681 = 50961^2 + 478041^2 .

It is a super-2 number, since 2×231120221202² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (231120221207) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1791168 + ... + 1915860.

Almost surely, 2^231120221202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231120221202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272706152082).

231120221202 is an abundant number, since it is smaller than the sum of its proper divisors (314292082962).

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

231120221202 is a wasteful number, since it uses less digits than its factorization.

231120221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124892 (or 124800 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 231120221202 its reverse (202122021132), we get a palindrome (433242242334).

The spelling of 231120221202 in words is "two hundred thirty-one billion, one hundred twenty million, two hundred twenty-one thousand, two hundred two".