21013110231031 has 8 divisors (see below), whose sum is σ = 21502748914064. Its totient is φ = 20523515261760.

The previous prime is 21013110230999. The next prime is 21013110231049. The reversal of 21013110231031 is 13013201131012.

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 21013110231031 - 2⁵ = 21013110230999 is a prime.

It is a super-2 number, since 2×21013110231031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013117231031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9954846 + ... + 11879611.

It is an arithmetic number, because the mean of its divisors is an integer number (2687843614258).

Almost surely, 2^{21013110231031} is an apocalyptic number.

21013110231031 is a deficient number, since it is larger than the sum of its proper divisors (489638683033).

21013110231031 is a wasteful number, since it uses less digits than its factorization.

21013110231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21856881.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 21013110231031 its reverse (13013201131012), we get a palindrome (34026311362043).

The spelling of 21013110231031 in words is "twenty-one trillion, thirteen billion, one hundred ten million, two hundred thirty-one thousand, thirty-one".