131133321221 has 6 divisors (see below), whose sum is σ = 152542843110. Its totient is φ = 112399989576.

The previous prime is 131133321217. The next prime is 131133321281. The reversal of 131133321221 is 122123331131.

It can be written as a sum of positive squares in only one way, i.e., 72166912321 + 58966408900 = 268639^2 + 242830^2 .

It is not a de Polignac number, because 131133321221 - 2² = 131133321217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131133321281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1338095066 + ... + 1338095163.

It is an arithmetic number, because the mean of its divisors is an integer number (25423807185).

Almost surely, 2^131133321221 is an apocalyptic number.

It is an amenable number.

131133321221 is a deficient number, since it is larger than the sum of its proper divisors (21409521889).

131133321221 is an equidigital number, since it uses as much as digits as its factorization.

131133321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676190243 (or 2676190236 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

Adding to 131133321221 its reverse (122123331131), we get a palindrome (253256652352).

The spelling of 131133321221 in words is "one hundred thirty-one billion, one hundred thirty-three million, three hundred twenty-one thousand, two hundred twenty-one".