20101131121013 has 4 divisors (see below), whose sum is σ = 21159085390560. Its totient is φ = 19043176851468.

The previous prime is 20101131121009. The next prime is 20101131121063. The reversal of 20101131121013 is 31012113110102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20101131121013 - 2² = 20101131121009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101131120982 and 20101131121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101131121003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528977134745 + ... + 528977134782.

It is an arithmetic number, because the mean of its divisors is an integer number (5289771347640).

Almost surely, 2^{20101131121013} is an apocalyptic number.

It is an amenable number.

20101131121013 is a deficient number, since it is larger than the sum of its proper divisors (1057954269547).

20101131121013 is a wasteful number, since it uses less digits than its factorization.

20101131121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057954269546.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20101131121013 its reverse (31012113110102), we get a palindrome (51113244231115).

The spelling of 20101131121013 in words is "twenty trillion, one hundred one billion, one hundred thirty-one million, one hundred twenty-one thousand, thirteen".