21183335272 has 128 divisors (see below), whose sum is σ = 45245122560. Its totient is φ = 9214571520.

The previous prime is 21183335269. The next prime is 21183335309. The reversal of 21183335272 is 27253338112.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45752113 + ... + 45752575.

It is an arithmetic number, because the mean of its divisors is an integer number (353477520).

Almost surely, 2^21183335272 is an apocalyptic number.

21183335272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21183335272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22622561280).

21183335272 is an abundant number, since it is smaller than the sum of its proper divisors (24061787288).

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

21183335272 is a wasteful number, since it uses less digits than its factorization.

21183335272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 739 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The spelling of 21183335272 in words is "twenty-one billion, one hundred eighty-three million, three hundred thirty-five thousand, two hundred seventy-two".