21404530140 has 48 divisors (see below), whose sum is σ = 68494497792. Its totient is φ = 4892463936.

The previous prime is 21404530139. The next prime is 21404530183. The reversal of 21404530140 is 4103540412.

It is a self number, because there is not a number n which added to its sum of digits gives 21404530140.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25481164 + ... + 25482003.

It is an arithmetic number, because the mean of its divisors is an integer number (1426968704).

Almost surely, 2^21404530140 is an apocalyptic number.

21404530140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404530140 is an abundant number, since it is smaller than the sum of its proper divisors (47089967652).

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

21404530140 is a wasteful number, since it uses less digits than its factorization.

21404530140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50963186 (or 50963184 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21404530140 in words is "twenty-one billion, four hundred four million, five hundred thirty thousand, one hundred forty".