21431435213140 has 12 divisors (see below), whose sum is σ = 45006013947636. Its totient is φ = 8572574085248.

The previous prime is 21431435213119. The next prime is 21431435213249. The reversal of 21431435213140 is 4131253413412.

It can be written as a sum of positive squares in 2 ways, for example, as 16485321484944 + 4946113728196 = 4060212^2 + 2223986^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21431435213096 and 21431435213105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535785880309 + ... + 535785880348.

It is an arithmetic number, because the mean of its divisors is an integer number (3750501162303).

Almost surely, 2^{21431435213140} is an apocalyptic number.

21431435213140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431435213140 is an abundant number, since it is smaller than the sum of its proper divisors (23574578734496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431435213140 is a wasteful number, since it uses less digits than its factorization.

21431435213140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071571760666 (or 1071571760664 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21431435213140 its reverse (4131253413412), we get a palindrome (25562688626552).

The spelling of 21431435213140 in words is "twenty-one trillion, four hundred thirty-one billion, four hundred thirty-five million, two hundred thirteen thousand, one hundred forty".