21335103520 has 48 divisors (see below), whose sum is σ = 51011493120. Its totient is φ = 8431216384.

The previous prime is 21335103497. The next prime is 21335103521. The reversal of 21335103520 is 2530153312.

It is not an unprimeable number, because it can be changed into a prime (21335103521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790000 + ... + 816559.

It is an arithmetic number, because the mean of its divisors is an integer number (1062739440).

Almost surely, 2^21335103520 is an apocalyptic number.

21335103520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21335103520 is an abundant number, since it is smaller than the sum of its proper divisors (29676389600).

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

21335103520 is a wasteful number, since it uses less digits than its factorization.

21335103520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606657 (or 1606649 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

Adding to 21335103520 its reverse (2530153312), we get a palindrome (23865256832).

The spelling of 21335103520 in words is "twenty-one billion, three hundred thirty-five million, one hundred three thousand, five hundred twenty".