131220212221131 has 96 divisors (see below), whose sum is σ = 195662256229440. Its totient is φ = 78153607741440.

The previous prime is 131220212221129. The next prime is 131220212221157. The reversal of 131220212221131 is 131122212022131.

It is not a de Polignac number, because 131220212221131 - 2¹ = 131220212221129 is a prime.

It is a super-2 number, since 2×131220212221131² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131220210221131) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6447207051 + ... + 6447227403.

It is an arithmetic number, because the mean of its divisors is an integer number (2038148502390).

Almost surely, 2^{131220212221131} is an apocalyptic number.

131220212221131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131220212221131 is a deficient number, since it is larger than the sum of its proper divisors (64442044008309).

131220212221131 is a wasteful number, since it uses less digits than its factorization.

131220212221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21677 (or 21666 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 131220212221131 its reverse (131122212022131), we get a palindrome (262342424243262).

The spelling of 131220212221131 in words is "one hundred thirty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-one thousand, one hundred thirty-one".