21240503140 has 12 divisors (see below), whose sum is σ = 44605056636. Its totient is φ = 8496201248.

The previous prime is 21240503113. The next prime is 21240503149. The reversal of 21240503140 is 4130504212.

It can be written as a sum of positive squares in 2 ways, for example, as 11411366976 + 9829136164 = 106824^2 + 99142^2 .

It is not an unprimeable number, because it can be changed into a prime (21240503149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531012559 + ... + 531012598.

It is an arithmetic number, because the mean of its divisors is an integer number (3717088053).

Almost surely, 2^21240503140 is an apocalyptic number.

21240503140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240503140 is an abundant number, since it is smaller than the sum of its proper divisors (23364553496).

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

21240503140 is a wasteful number, since it uses less digits than its factorization.

21240503140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062025166 (or 1062025164 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 21240503140 in words is "twenty-one billion, two hundred forty million, five hundred three thousand, one hundred forty".