21230101031 has 4 divisors (see below), whose sum is σ = 21352818552. Its totient is φ = 21107383512.

The previous prime is 21230101001. The next prime is 21230101043. The reversal of 21230101031 is 13010103212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21230101031 - 2¹⁰ = 21230100007 is a prime.

It is a super-2 number, since 2×21230101031² (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 = 21230100997 and 21230101015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230101001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61358501 + ... + 61358846.

It is an arithmetic number, because the mean of its divisors is an integer number (5338204638).

Almost surely, 2^21230101031 is an apocalyptic number.

21230101031 is a deficient number, since it is larger than the sum of its proper divisors (122717521).

21230101031 is a wasteful number, since it uses less digits than its factorization.

21230101031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122717520.

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

Adding to 21230101031 its reverse (13010103212), we get a palindrome (34240204243).

The spelling of 21230101031 in words is "twenty-one billion, two hundred thirty million, one hundred one thousand, thirty-one".