21303450531 has 12 divisors (see below), whose sum is σ = 33569073720. Its totient is φ = 12911182080.

The previous prime is 21303450523. The next prime is 21303450559. The reversal of 21303450531 is 13505430312.

21303450531 is a `hidden beast` number, since 21 + 30 + 34 + 50 + 531 = 666.

It is not a de Polignac number, because 21303450531 - 2³ = 21303450523 is a prime.

It is a super-2 number, since 2×21303450531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21303450495 and 21303450504.

It is not an unprimeable number, because it can be changed into a prime (21303450031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107593086 + ... + 107593283.

It is an arithmetic number, because the mean of its divisors is an integer number (2797422810).

Almost surely, 2^21303450531 is an apocalyptic number.

21303450531 is a deficient number, since it is larger than the sum of its proper divisors (12265623189).

21303450531 is a wasteful number, since it uses less digits than its factorization.

21303450531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215186386 (or 215186383 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21303450531 its reverse (13505430312), we get a palindrome (34808880843).

The spelling of 21303450531 in words is "twenty-one billion, three hundred three million, four hundred fifty thousand, five hundred thirty-one".