21042313031 has 8 divisors (see below), whose sum is σ = 22113607824. Its totient is φ = 19997470080.

The previous prime is 21042313009. The next prime is 21042313037. The reversal of 21042313031 is 13031324012.

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 21042313031 - 2²⁶ = 20975204167 is a prime.

It is a super-2 number, since 2×21042313031² (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 = 21042312994 and 21042313012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042313037) 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, 6611330 + ... + 6614511.

It is an arithmetic number, because the mean of its divisors is an integer number (2764200978).

Almost surely, 2^21042313031 is an apocalyptic number.

21042313031 is a deficient number, since it is larger than the sum of its proper divisors (1071294793).

21042313031 is a wasteful number, since it uses less digits than its factorization.

21042313031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13225921.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21042313031 its reverse (13031324012), we get a palindrome (34073637043).

The spelling of 21042313031 in words is "twenty-one billion, forty-two million, three hundred thirteen thousand, thirty-one".