21203031340 has 12 divisors (see below), whose sum is σ = 44526365856. Its totient is φ = 8481212528.

The previous prime is 21203031299. The next prime is 21203031341. The reversal of 21203031340 is 4313030212.

It is not an unprimeable number, because it can be changed into a prime (21203031341) by changing a digit.

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, 530075764 + ... + 530075803.

It is an arithmetic number, because the mean of its divisors is an integer number (3710530488).

Almost surely, 2^21203031340 is an apocalyptic number.

21203031340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203031340 is an abundant number, since it is smaller than the sum of its proper divisors (23323334516).

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

21203031340 is a wasteful number, since it uses less digits than its factorization.

21203031340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060151576 (or 1060151574 counting only the distinct ones).

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

Adding to 21203031340 its reverse (4313030212), we get a palindrome (25516061552).

The spelling of 21203031340 in words is "twenty-one billion, two hundred three million, thirty-one thousand, three hundred forty".