21025474272 has 144 divisors (see below), whose sum is σ = 65805103728. Its totient is φ = 6314864640.

The previous prime is 21025474241. The next prime is 21025474273. The reversal of 21025474272 is 27247452012.

21025474272 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 547 + 42 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025474273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 328618 + ... + 387350.

It is an arithmetic number, because the mean of its divisors is an integer number (456979887).

Almost surely, 2^21025474272 is an apocalyptic number.

21025474272 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 21025474272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32902551864).

21025474272 is an abundant number, since it is smaller than the sum of its proper divisors (44779629456).

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

21025474272 is a wasteful number, since it uses less digits than its factorization.

21025474272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58873 (or 58862 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 36.

The spelling of 21025474272 in words is "twenty-one billion, twenty-five million, four hundred seventy-four thousand, two hundred seventy-two".