21246272872 has 96 divisors (see below), whose sum is σ = 46267401600. Its totient is φ = 9114336000.

The previous prime is 21246272807. The next prime is 21246272881. The reversal of 21246272872 is 27827264212.

It is a super-2 number, since 2×21246272872² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5166097 + ... + 5170207.

It is an arithmetic number, because the mean of its divisors is an integer number (481952100).

Almost surely, 2^21246272872 is an apocalyptic number.

21246272872 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 21246272872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23133700800).

21246272872 is an abundant number, since it is smaller than the sum of its proper divisors (25021128728).

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

21246272872 is a wasteful number, since it uses less digits than its factorization.

21246272872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439 (or 4424 counting only the distinct ones).

The product of its digits is 301056, while the sum is 43.

The spelling of 21246272872 in words is "twenty-one billion, two hundred forty-six million, two hundred seventy-two thousand, eight hundred seventy-two".