21003322440 has 32 divisors (see below), whose sum is σ = 63009967680. Its totient is φ = 5600885952.

The previous prime is 21003322433. The next prime is 21003322481. The reversal of 21003322440 is 4422330012.

It is a super-2 number, since 2×21003322440² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87513724 + ... + 87513963.

It is an arithmetic number, because the mean of its divisors is an integer number (1969061490).

Almost surely, 2^21003322440 is an apocalyptic number.

21003322440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003322440 is an abundant number, since it is smaller than the sum of its proper divisors (42006645240).

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

21003322440 is a wasteful number, since it uses less digits than its factorization.

21003322440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175027701 (or 175027697 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21003322440 its reverse (4422330012), we get a palindrome (25425652452).

The spelling of 21003322440 in words is "twenty-one billion, three million, three hundred twenty-two thousand, four hundred forty".