21124331031 has 16 divisors (see below), whose sum is σ = 28748920320. Its totient is φ = 13793077440.

The previous prime is 21124331021. The next prime is 21124331047. The reversal of 21124331031 is 13013342112.

It is not a de Polignac number, because 21124331031 - 2¹⁷ = 21124199959 is a prime.

It is a super-2 number, since 2×21124331031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21124330989 and 21124331007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124331021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172230 + ... + 268163.

It is an arithmetic number, because the mean of its divisors is an integer number (1796807520).

Almost surely, 2^21124331031 is an apocalyptic number.

21124331031 is a deficient number, since it is larger than the sum of its proper divisors (7624589289).

21124331031 is a wasteful number, since it uses less digits than its factorization.

21124331031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440726.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21124331031 its reverse (13013342112), we get a palindrome (34137673143).

The spelling of 21124331031 in words is "twenty-one billion, one hundred twenty-four million, three hundred thirty-one thousand, thirty-one".