21225272000 has 112 divisors (see below), whose sum is σ = 53985798048. Its totient is φ = 8260531200.

The previous prime is 21225271973. The next prime is 21225272017. The reversal of 21225272000 is 27252212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260147 + ... + 331853.

It is an arithmetic number, because the mean of its divisors is an integer number (482016054).

Almost surely, 2^21225272000 is an apocalyptic number.

21225272000 is a gapful number since it is divisible by the number (20) 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 21225272000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26992899024).

21225272000 is an abundant number, since it is smaller than the sum of its proper divisors (32760526048).

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

21225272000 is an equidigital number, since it uses as much as digits as its factorization.

21225272000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71771 (or 71751 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The spelling of 21225272000 in words is "twenty-one billion, two hundred twenty-five million, two hundred seventy-two thousand".