21100330031 has 8 divisors (see below), whose sum is σ = 23020146000. Its totient is φ = 19180781440.

The previous prime is 21100330003. The next prime is 21100330039. The reversal of 21100330031 is 13003300112.

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-21100330031 is a prime.

It is a super-2 number, since 2×21100330031² (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 = 21100329988 and 21100330015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100330039) 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, 121175 + ... + 238503.

It is an arithmetic number, because the mean of its divisors is an integer number (2877518250).

Almost surely, 2^21100330031 is an apocalyptic number.

21100330031 is a deficient number, since it is larger than the sum of its proper divisors (1919815969).

21100330031 is a wasteful number, since it uses less digits than its factorization.

21100330031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133689.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 21100330031 its reverse (13003300112), we get a palindrome (34103630143).

The spelling of 21100330031 in words is "twenty-one billion, one hundred million, three hundred thirty thousand, thirty-one".