21112203310031 has 4 divisors (see below), whose sum is σ = 21112212540672. Its totient is φ = 21112194079392.

The previous prime is 21112203309973. The next prime is 21112203310067. The reversal of 21112203310031 is 13001330221112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21112203310031 - 2¹⁰ = 21112203309007 is a prime.

It is a super-2 number, since 2×21112203310031² (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 = 21112203309985 and 21112203310012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112203310531) 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, 1655591 + ... + 6705623.

It is an arithmetic number, because the mean of its divisors is an integer number (5278053135168).

Almost surely, 2^{21112203310031} is an apocalyptic number.

21112203310031 is a deficient number, since it is larger than the sum of its proper divisors (9230641).

21112203310031 is an equidigital number, since it uses as much as digits as its factorization.

21112203310031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9230640.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21112203310031 its reverse (13001330221112), we get a palindrome (34113533531143).

The spelling of 21112203310031 in words is "twenty-one trillion, one hundred twelve billion, two hundred three million, three hundred ten thousand, thirty-one".