131211021222 has 48 divisors (see below), whose sum is σ = 303993922752. Its totient is φ = 40756665600.

The previous prime is 131211021209. The next prime is 131211021247. The reversal of 131211021222 is 222120112131.

131211021222 is a `hidden beast` number, since 1 + 312 + 110 + 21 + 222 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 131211021195 and 131211021204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2091838 + ... + 2153649.

It is an arithmetic number, because the mean of its divisors is an integer number (6333206724).

Almost surely, 2^131211021222 is an apocalyptic number.

131211021222 is an abundant number, since it is smaller than the sum of its proper divisors (172782901530).

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

131211021222 is a wasteful number, since it uses less digits than its factorization.

131211021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245613 (or 4245610 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 131211021222 its reverse (222120112131), we get a palindrome (353331133353).

Subtracting 131211021222 from its reverse (222120112131), we obtain a palindrome (90909090909).

The spelling of 131211021222 in words is "one hundred thirty-one billion, two hundred eleven million, twenty-one thousand, two hundred twenty-two".