21323421140 has 36 divisors (see below), whose sum is σ = 52090074036. Its totient is φ = 7310886912.

The previous prime is 21323421127. The next prime is 21323421143. The reversal of 21323421140 is 4112432312.

It can be written as a sum of positive squares in 2 ways, for example, as 6203767696 + 15119653444 = 78764^2 + 122962^2 .

It is a super-2 number, since 2×21323421140² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323421143) 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, 10878317 + ... + 10880276.

It is an arithmetic number, because the mean of its divisors is an integer number (1446946501).

Almost surely, 2^21323421140 is an apocalyptic number.

21323421140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21323421140 is an abundant number, since it is smaller than the sum of its proper divisors (30766652896).

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

21323421140 is a wasteful number, since it uses less digits than its factorization.

21323421140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21758616 (or 21758607 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21323421140 its reverse (4112432312), we get a palindrome (25435853452).

The spelling of 21323421140 in words is "twenty-one billion, three hundred twenty-three million, four hundred twenty-one thousand, one hundred forty".