21440512050531 has 24 divisors (see below), whose sum is σ = 34153446672720. Its totient is φ = 11920593569472.

The previous prime is 21440512050511. The next prime is 21440512050571. The reversal of 21440512050531 is 13505021504412.

It is not a de Polignac number, because 21440512050531 - 2⁵ = 21440512050499 is a prime.

It is a super-2 number, since 2×21440512050531² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21440512050492 and 21440512050501.

It is not an unprimeable number, because it can be changed into a prime (21440512050511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1970992176 + ... + 1971003053.

It is an arithmetic number, because the mean of its divisors is an integer number (1423060278030).

Almost surely, 2^{21440512050531} is an apocalyptic number.

21440512050531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21440512050531 is a deficient number, since it is larger than the sum of its proper divisors (12712934622189).

21440512050531 is a wasteful number, since it uses less digits than its factorization.

21440512050531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941995283 (or 3941995276 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 21440512050531 its reverse (13505021504412), we get a palindrome (34945533554943).

The spelling of 21440512050531 in words is "twenty-one trillion, four hundred forty billion, five hundred twelve million, fifty thousand, five hundred thirty-one".