21475000321 has 8 divisors (see below), whose sum is σ = 22760524584. Its totient is φ = 20191952640.

The previous prime is 21475000307. The next prime is 21475000333. The reversal of 21475000321 is 12300057412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1758628096 + 19716372225 = 41936^2 + 140415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21475000321 - 2⁵ = 21475000289 is a prime.

It is a super-2 number, since 2×21475000321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21475000301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601270 + ... + 635983.

It is an arithmetic number, because the mean of its divisors is an integer number (2845065573).

Almost surely, 2^21475000321 is an apocalyptic number.

It is an amenable number.

21475000321 is a deficient number, since it is larger than the sum of its proper divisors (1285524263).

21475000321 is a wasteful number, since it uses less digits than its factorization.

21475000321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238291.

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 21475000321 its reverse (12300057412), we get a palindrome (33775057733).

The spelling of 21475000321 in words is "twenty-one billion, four hundred seventy-five million, three hundred twenty-one", and thus it is an aban number.