21153343350 has 24 divisors (see below), whose sum is σ = 52460291880. Its totient is φ = 5640891520.

The previous prime is 21153343243. The next prime is 21153343361. The reversal of 21153343350 is 5334335112.

21153343350 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70510995 + ... + 70511294.

It is an arithmetic number, because the mean of its divisors is an integer number (2185845495).

Almost surely, 2^21153343350 is an apocalyptic number.

21153343350 is an abundant number, since it is smaller than the sum of its proper divisors (31306948530).

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

21153343350 is a wasteful number, since it uses less digits than its factorization.

21153343350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141022304 (or 141022299 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 21153343350 its reverse (5334335112), we get a palindrome (26487678462).

The spelling of 21153343350 in words is "twenty-one billion, one hundred fifty-three million, three hundred forty-three thousand, three hundred fifty".