20131121131 has 16 divisors (see below), whose sum is σ = 22276643328. Its totient is φ = 18039772000.

The previous prime is 20131121117. The next prime is 20131121141. The reversal of 20131121131 is 13112113102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20131121131 - 2¹¹ = 20131119083 is a prime.

It is a super-2 number, since 2×20131121131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131121141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212286 + ... + 292108.

It is an arithmetic number, because the mean of its divisors is an integer number (1392290208).

Almost surely, 2^20131121131 is an apocalyptic number.

20131121131 is a deficient number, since it is larger than the sum of its proper divisors (2145522197).

20131121131 is a wasteful number, since it uses less digits than its factorization.

20131121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80162.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20131121131 its reverse (13112113102), we get a palindrome (33243234233).

The spelling of 20131121131 in words is "twenty billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred thirty-one".