21403836140 has 12 divisors (see below), whose sum is σ = 44948055936. Its totient is φ = 8561534448.

The previous prime is 21403836067. The next prime is 21403836169. The reversal of 21403836140 is 4163830412.

It is a junction number, because it is equal to n+sod(n) for n = 21403836097 and 21403836106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535095884 + ... + 535095923.

It is an arithmetic number, because the mean of its divisors is an integer number (3745671328).

Almost surely, 2^21403836140 is an apocalyptic number.

21403836140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21403836140 is an abundant number, since it is smaller than the sum of its proper divisors (23544219796).

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

21403836140 is a wasteful number, since it uses less digits than its factorization.

21403836140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070191816 (or 1070191814 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21403836140 in words is "twenty-one billion, four hundred three million, eight hundred thirty-six thousand, one hundred forty".