21120103031 has 8 divisors (see below), whose sum is σ = 21332528064. Its totient is φ = 20907743200.

The previous prime is 21120103019. The next prime is 21120103033. The reversal of 21120103031 is 13030102112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120103031 is a prime.

It is a super-2 number, since 2×21120103031² (a number of 21 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 = 21120102997 and 21120103015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120103033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880706 + ... + 904368.

It is an arithmetic number, because the mean of its divisors is an integer number (2666566008).

Almost surely, 2^21120103031 is an apocalyptic number.

21120103031 is a deficient number, since it is larger than the sum of its proper divisors (212425033).

21120103031 is a wasteful number, since it uses less digits than its factorization.

21120103031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32601.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21120103031 its reverse (13030102112), we get a palindrome (34150205143).

The spelling of 21120103031 in words is "twenty-one billion, one hundred twenty million, one hundred three thousand, thirty-one".