21030031101 has 8 divisors (see below), whose sum is σ = 29689455744. Its totient is φ = 13195313600.

The previous prime is 21030031097. The next prime is 21030031153. The reversal of 21030031101 is 10113003012.

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

It is a cyclic number.

It is not a de Polignac number, because 21030031101 - 2² = 21030031097 is a prime.

It is a super-3 number, since 3×21030031101³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030031171) 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 7 ways as a sum of consecutive naturals, for example, 206176725 + ... + 206176826.

It is an arithmetic number, because the mean of its divisors is an integer number (3711181968).

Almost surely, 2^21030031101 is an apocalyptic number.

It is an amenable number.

21030031101 is a deficient number, since it is larger than the sum of its proper divisors (8659424643).

21030031101 is a wasteful number, since it uses less digits than its factorization.

21030031101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412353571.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21030031101 its reverse (10113003012), we get a palindrome (31143034113).

The spelling of 21030031101 in words is "twenty-one billion, thirty million, thirty-one thousand, one hundred one".