21120303340 has 24 divisors (see below), whose sum is σ = 44406563040. Its totient is φ = 8437849728.

The previous prime is 21120303313. The next prime is 21120303343. The reversal of 21120303340 is 4330302112.

It is not an unprimeable number, because it can be changed into a prime (21120303343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625105 + ... + 658024.

It is an arithmetic number, because the mean of its divisors is an integer number (1850273460).

Almost surely, 2^21120303340 is an apocalyptic number.

21120303340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120303340 is an abundant number, since it is smaller than the sum of its proper divisors (23286259700).

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

21120303340 is a wasteful number, since it uses less digits than its factorization.

21120303340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283961 (or 1283959 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21120303340 its reverse (4330302112), we get a palindrome (25450605452).

The spelling of 21120303340 in words is "twenty-one billion, one hundred twenty million, three hundred three thousand, three hundred forty".