21324281140 has 12 divisors (see below), whose sum is σ = 44780990436. Its totient is φ = 8529712448.

The previous prime is 21324281137. The next prime is 21324281159. The reversal of 21324281140 is 4118242312.

It can be written as a sum of positive squares in 2 ways, for example, as 14150529936 + 7173751204 = 118956^2 + 84698^2 .

It is a super-2 number, since 2×21324281140² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21324281099 and 21324281108.

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, 533107009 + ... + 533107048.

It is an arithmetic number, because the mean of its divisors is an integer number (3731749203).

Almost surely, 2^21324281140 is an apocalyptic number.

21324281140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324281140 is an abundant number, since it is smaller than the sum of its proper divisors (23456709296).

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

21324281140 is a wasteful number, since it uses less digits than its factorization.

21324281140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066214066 (or 1066214064 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The spelling of 21324281140 in words is "twenty-one billion, three hundred twenty-four million, two hundred eighty-one thousand, one hundred forty".