21112200031 has 4 divisors (see below), whose sum is σ = 22736215432. Its totient is φ = 19488184632.

The previous prime is 21112200029. The next prime is 21112200049. The reversal of 21112200031 is 13000221112.

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 21112200031 - 2¹ = 21112200029 is a prime.

It is a super-2 number, since 2×21112200031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1624015387 = 21112200031 / (2 + 1 + 1 + 1 + 2 + 2 + 0 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112199984 and 21112200020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112270031) 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, 812007681 + ... + 812007706.

It is an arithmetic number, because the mean of its divisors is an integer number (5684053858).

Almost surely, 2^21112200031 is an apocalyptic number.

21112200031 is a deficient number, since it is larger than the sum of its proper divisors (1624015401).

21112200031 is a wasteful number, since it uses less digits than its factorization.

21112200031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624015400.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21112200031 its reverse (13000221112), we get a palindrome (34112421143).

The spelling of 21112200031 in words is "twenty-one billion, one hundred twelve million, two hundred thousand, thirty-one".