21202322440 has 32 divisors (see below), whose sum is σ = 51374859480. Its totient is φ = 7828549632.

The previous prime is 21202322419. The next prime is 21202322441. The reversal of 21202322440 is 4422320212.

It can be written as a sum of positive squares in 4 ways, for example, as 10205444484 + 10996877956 = 101022^2 + 104866^2 .

It is not an unprimeable number, because it can be changed into a prime (21202322441) 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, 20386329 + ... + 20387368.

Almost surely, 2^21202322440 is an apocalyptic number.

21202322440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202322440 is an abundant number, since it is smaller than the sum of its proper divisors (30172537040).

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

21202322440 is a wasteful number, since it uses less digits than its factorization.

21202322440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40773721 (or 40773717 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21202322440 its reverse (4422320212), we get a palindrome (25624642652).

The spelling of 21202322440 in words is "twenty-one billion, two hundred two million, three hundred twenty-two thousand, four hundred forty".