201131021123 has 6 divisors (see below), whose sum is σ = 212274014364. Its totient is φ = 190545177564.

The previous prime is 201131021081. The next prime is 201131021153. The reversal of 201131021123 is 321120131102.

It is not a de Polignac number, because 201131021123 - 2¹⁸ = 201130758979 is a prime.

It is a super-2 number, since 2×201131021123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201131021153) 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, 278574461 + ... + 278575182.

It is an arithmetic number, because the mean of its divisors is an integer number (35379002394).

Almost surely, 2^201131021123 is an apocalyptic number.

201131021123 is a deficient number, since it is larger than the sum of its proper divisors (11142993241).

201131021123 is an equidigital number, since it uses as much as digits as its factorization.

201131021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557149681 (or 557149662 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 201131021123 its reverse (321120131102), we get a palindrome (522251152225).

The spelling of 201131021123 in words is "two hundred one billion, one hundred thirty-one million, twenty-one thousand, one hundred twenty-three".