21113032340 has 12 divisors (see below), whose sum is σ = 44337367956. Its totient is φ = 8445212928.

The previous prime is 21113032337. The next prime is 21113032357. The reversal of 21113032340 is 4323031112.

It can be written as a sum of positive squares in 2 ways, for example, as 5775696004 + 15337336336 = 75998^2 + 123844^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1055651617 = 21113032340 / (2 + 1 + 1 + 1 + 3 + 0 + 3 + 2 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527825789 + ... + 527825828.

It is an arithmetic number, because the mean of its divisors is an integer number (3694780663).

Almost surely, 2^21113032340 is an apocalyptic number.

21113032340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113032340 is an abundant number, since it is smaller than the sum of its proper divisors (23224335616).

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

21113032340 is a wasteful number, since it uses less digits than its factorization.

21113032340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055651626 (or 1055651624 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21113032340 its reverse (4323031112), we get a palindrome (25436063452).

The spelling of 21113032340 in words is "twenty-one billion, one hundred thirteen million, thirty-two thousand, three hundred forty".