21103413440 has 56 divisors (see below), whose sum is σ = 51002592432. Its totient is φ = 8315366400.

The previous prime is 21103413389. The next prime is 21103413467. The reversal of 21103413440 is 4431430112.

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, 470711 + ... + 513590.

Almost surely, 2^21103413440 is an apocalyptic number.

21103413440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103413440 is an abundant number, since it is smaller than the sum of its proper divisors (29899178992).

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

21103413440 is an equidigital number, since it uses as much as digits as its factorization.

21103413440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984385 (or 984375 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21103413440 its reverse (4431430112), we get a palindrome (25534843552).

The spelling of 21103413440 in words is "twenty-one billion, one hundred three million, four hundred thirteen thousand, four hundred forty".