131211020111 has 4 divisors (see below), whose sum is σ = 132510139224. Its totient is φ = 129911901000.

The previous prime is 131211020107. The next prime is 131211020189. The reversal of 131211020111 is 111020112131.

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

It is a cyclic number.

It is not a de Polignac number, because 131211020111 - 2² = 131211020107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211020911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649559405 + ... + 649559606.

It is an arithmetic number, because the mean of its divisors is an integer number (33127534806).

Almost surely, 2^131211020111 is an apocalyptic number.

131211020111 is a deficient number, since it is larger than the sum of its proper divisors (1299119113).

131211020111 is a wasteful number, since it uses less digits than its factorization.

131211020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299119112.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 131211020111 its reverse (111020112131), we get a palindrome (242231132242).

The spelling of 131211020111 in words is "one hundred thirty-one billion, two hundred eleven million, twenty thousand, one hundred eleven".