20123111022131 has 12 divisors (see below), whose sum is σ = 22272576347952. Its totient is φ = 18073147513248.

The previous prime is 20123111022107. The next prime is 20123111022137. The reversal of 20123111022131 is 13122011132102.

It is not a de Polignac number, because 20123111022131 - 2³⁴ = 20105931152947 is a prime.

It is a super-2 number, since 2×20123111022131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123111022137) 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, 565333415 + ... + 565369008.

It is an arithmetic number, because the mean of its divisors is an integer number (1856048028996).

Almost surely, 2^{20123111022131} is an apocalyptic number.

20123111022131 is a deficient number, since it is larger than the sum of its proper divisors (2149465325821).

20123111022131 is a wasteful number, since it uses less digits than its factorization.

20123111022131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130702510 (or 1130702473 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20123111022131 its reverse (13122011132102), we get a palindrome (33245122154233).

The spelling of 20123111022131 in words is "twenty trillion, one hundred twenty-three billion, one hundred eleven million, twenty-two thousand, one hundred thirty-one".