21335409340 has 48 divisors (see below), whose sum is σ = 51357039552. Its totient is φ = 7293275136.

The previous prime is 21335409331. The next prime is 21335409379. The reversal of 21335409340 is 4390453312.

It is a junction number, because it is equal to n+sod(n) for n = 21335409296 and 21335409305.

It is a congruent number.

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, 178927 + ... + 273286.

It is an arithmetic number, because the mean of its divisors is an integer number (1069938324).

Almost surely, 2^21335409340 is an apocalyptic number.

21335409340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21335409340 is an abundant number, since it is smaller than the sum of its proper divisors (30021630212).

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

21335409340 is a wasteful number, since it uses less digits than its factorization.

21335409340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452566 (or 452564 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 21335409340 in words is "twenty-one billion, three hundred thirty-five million, four hundred nine thousand, three hundred forty".