21353345312 has 144 divisors (see below), whose sum is σ = 49129234560. Its totient is φ = 9075904512.

The previous prime is 21353345213. The next prime is 21353345371. The reversal of 21353345312 is 21354335312.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5648639 + ... + 5652417.

It is an arithmetic number, because the mean of its divisors is an integer number (341175240).

Almost surely, 2^21353345312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21353345312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24564617280).

21353345312 is an abundant number, since it is smaller than the sum of its proper divisors (27775889248).

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

21353345312 is a wasteful number, since it uses less digits than its factorization.

21353345312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3883 (or 3858 counting only the distinct ones).

The product of its digits is 32400, while the sum is 32.

The spelling of 21353345312 in words is "twenty-one billion, three hundred fifty-three million, three hundred forty-five thousand, three hundred twelve".