131211210122 has 4 divisors (see below), whose sum is σ = 196816815186. Its totient is φ = 65605605060.

The previous prime is 131211210089. The next prime is 131211210131. The reversal of 131211210122 is 221012112131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 101939079841 + 29272130281 = 319279^2 + 171091^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131211210122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32802802529 + ... + 32802802532.

Almost surely, 2^131211210122 is an apocalyptic number.

131211210122 is a deficient number, since it is larger than the sum of its proper divisors (65605605064).

131211210122 is an equidigital number, since it uses as much as digits as its factorization.

131211210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65605605063.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 131211210122 its reverse (221012112131), we get a palindrome (352223322253).

The spelling of 131211210122 in words is "one hundred thirty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-two".