21353744120 has 32 divisors (see below), whose sum is σ = 48053286720. Its totient is φ = 8540188800.

The previous prime is 21353744063. The next prime is 21353744123. The reversal of 21353744120 is 2144735312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353744123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248714 + ... + 323366.

It is an arithmetic number, because the mean of its divisors is an integer number (1501665210).

Almost surely, 2^21353744120 is an apocalyptic number.

21353744120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21353744120 is an abundant number, since it is smaller than the sum of its proper divisors (26699542600).

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

21353744120 is a wasteful number, since it uses less digits than its factorization.

21353744120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81815 (or 81811 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21353744120 in words is "twenty-one billion, three hundred fifty-three million, seven hundred forty-four thousand, one hundred twenty".