201311212131 has 12 divisors (see below), whose sum is σ = 303425595408. Its totient is φ = 128372367024.

The previous prime is 201311212099. The next prime is 201311212159. The reversal of 201311212131 is 131212113102.

201311212131 is a `hidden beast` number, since 201 + 311 + 2 + 121 + 31 = 666.

It is not a de Polignac number, because 201311212131 - 2⁵ = 201311212099 is a prime.

It is a super-2 number, since 2×201311212131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201311212181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 486258760 + ... + 486259173.

It is an arithmetic number, because the mean of its divisors is an integer number (25285466284).

Almost surely, 2^201311212131 is an apocalyptic number.

201311212131 is a deficient number, since it is larger than the sum of its proper divisors (102114383277).

201311212131 is a wasteful number, since it uses less digits than its factorization.

201311212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972517962 (or 972517959 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 201311212131 its reverse (131212113102), we get a palindrome (332523325233).

The spelling of 201311212131 in words is "two hundred one billion, three hundred eleven million, two hundred twelve thousand, one hundred thirty-one".