21035504340 has 72 divisors (see below), whose sum is σ = 64088912160. Its totient is φ = 5584745664.

The previous prime is 21035504327. The next prime is 21035504383. The reversal of 21035504340 is 4340553012.

21035504340 is a `hidden beast` number, since 2 + 103 + 550 + 4 + 3 + 4 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216550 + ... + 298269.

It is an arithmetic number, because the mean of its divisors is an integer number (890123780).

Almost surely, 2^21035504340 is an apocalyptic number.

21035504340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21035504340 is an abundant number, since it is smaller than the sum of its proper divisors (43053407820).

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

21035504340 is a wasteful number, since it uses less digits than its factorization.

21035504340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515061 (or 515056 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21035504340 in words is "twenty-one billion, thirty-five million, five hundred four thousand, three hundred forty".