21023030240431 has 4 divisors (see below), whose sum is σ = 21023050905000. Its totient is φ = 21023009575864.

The previous prime is 21023030240417. The next prime is 21023030240483. The reversal of 21023030240431 is 13404203032012.

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 21023030240431 - 2³³ = 21014440305839 is a prime.

It is a super-2 number, since 2×21023030240431² (a number of 27 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 = 21023030240396 and 21023030240405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023030280431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8722681 + ... + 10868818.

It is an arithmetic number, because the mean of its divisors is an integer number (5255762726250).

Almost surely, 2^{21023030240431} is an apocalyptic number.

21023030240431 is a deficient number, since it is larger than the sum of its proper divisors (20664569).

21023030240431 is a wasteful number, since it uses less digits than its factorization.

21023030240431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20664568.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21023030240431 its reverse (13404203032012), we get a palindrome (34427233272443).

The spelling of 21023030240431 in words is "twenty-one trillion, twenty-three billion, thirty million, two hundred forty thousand, four hundred thirty-one".