131211133221 has 16 divisors (see below), whose sum is σ = 204021200000. Its totient is φ = 74977789824.

The previous prime is 131211133127. The next prime is 131211133237. The reversal of 131211133221 is 122331112131.

It is not a de Polignac number, because 131211133221 - 2¹⁷ = 131211002149 is a prime.

It is a super-2 number, since 2×131211133221² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211133271) 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, 63755596 + ... + 63757653.

It is an arithmetic number, because the mean of its divisors is an integer number (12751325000).

Almost surely, 2^131211133221 is an apocalyptic number.

It is an amenable number.

131211133221 is a deficient number, since it is larger than the sum of its proper divisors (72810066779).

131211133221 is an equidigital number, since it uses as much as digits as its factorization.

131211133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127513273 (or 127513259 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

Adding to 131211133221 its reverse (122331112131), we get a palindrome (253542245352).

The spelling of 131211133221 in words is "one hundred thirty-one billion, two hundred eleven million, one hundred thirty-three thousand, two hundred twenty-one".