20101131123 has 16 divisors (see below), whose sum is σ = 27054339840. Its totient is φ = 13274401824.

The previous prime is 20101131107. The next prime is 20101131163. The reversal of 20101131123 is 32113110102.

It is a happy number.

It is not a de Polignac number, because 20101131123 - 2⁴ = 20101131107 is a prime.

It is a super-2 number, since 2×20101131123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20101131163) 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, 2279040 + ... + 2287842.

It is an arithmetic number, because the mean of its divisors is an integer number (1690896240).

Almost surely, 2^20101131123 is an apocalyptic number.

20101131123 is a deficient number, since it is larger than the sum of its proper divisors (6953208717).

20101131123 is a wasteful number, since it uses less digits than its factorization.

20101131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15898.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20101131123 its reverse (32113110102), we get a palindrome (52214241225).

The spelling of 20101131123 in words is "twenty billion, one hundred one million, one hundred thirty-one thousand, one hundred twenty-three".