20213100111031 has 4 divisors (see below), whose sum is σ = 20326022458200. Its totient is φ = 20100177763864.

The previous prime is 20213100110999. The next prime is 20213100111059. The reversal of 20213100111031 is 13011100131202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20213100111031 - 2⁵ = 20213100110999 is a prime.

It is a super-2 number, since 2×20213100111031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20213100110996 and 20213100111014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20213100111091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56461173316 + ... + 56461173673.

It is an arithmetic number, because the mean of its divisors is an integer number (5081505614550).

Almost surely, 2^{20213100111031} is an apocalyptic number.

20213100111031 is a deficient number, since it is larger than the sum of its proper divisors (112922347169).

20213100111031 is a wasteful number, since it uses less digits than its factorization.

20213100111031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112922347168.

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

Adding to 20213100111031 its reverse (13011100131202), we get a palindrome (33224200242233).

The spelling of 20213100111031 in words is "twenty trillion, two hundred thirteen billion, one hundred million, one hundred eleven thousand, thirty-one".