21535347340 has 48 divisors (see below), whose sum is σ = 48749974560. Its totient is φ = 7943846400.

The previous prime is 21535347311. The next prime is 21535347359. The reversal of 21535347340 is 4374353512.

It is a self number, because there is not a number n which added to its sum of digits gives 21535347340.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233856 + ... + 312664.

It is an arithmetic number, because the mean of its divisors is an integer number (1015624470).

Almost surely, 2^21535347340 is an apocalyptic number.

21535347340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21535347340 is an abundant number, since it is smaller than the sum of its proper divisors (27214627220).

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

21535347340 is a wasteful number, since it uses less digits than its factorization.

21535347340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79882 (or 79880 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 37.

The spelling of 21535347340 in words is "twenty-one billion, five hundred thirty-five million, three hundred forty-seven thousand, three hundred forty".