131221121011 has 8 divisors (see below), whose sum is σ = 134277948464. Its totient is φ = 128164528800.

The previous prime is 131221120993. The next prime is 131221121113. The reversal of 131221121011 is 110121122131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221121011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221125011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1623661 + ... + 1702561.

It is an arithmetic number, because the mean of its divisors is an integer number (16784743558).

Almost surely, 2^131221121011 is an apocalyptic number.

131221121011 is a deficient number, since it is larger than the sum of its proper divisors (3056827453).

131221121011 is an equidigital number, since it uses as much as digits as its factorization.

131221121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117621.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 131221121011 its reverse (110121122131), we get a palindrome (241342243142).

The spelling of 131221121011 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, eleven".