21641150272 has 42 divisors (see below), whose sum is σ = 49955455842. Its totient is φ = 9274777344.

The previous prime is 21641150257. The next prime is 21641150339. The reversal of 21641150272 is 27205114612.

It can be written as a sum of positive squares in only one way, i.e., 10954552896 + 10686597376 = 104664^2 + 103376^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 3447303 + ... + 3453574.

Almost surely, 2^21641150272 is an apocalyptic number.

It is an amenable number.

21641150272 is an abundant number, since it is smaller than the sum of its proper divisors (28314305570).

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

21641150272 is an equidigital number, since it uses as much as digits as its factorization.

21641150272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6900903 (or 6900886 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

Adding to 21641150272 its reverse (27205114612), we get a palindrome (48846264884).

The spelling of 21641150272 in words is "twenty-one billion, six hundred forty-one million, one hundred fifty thousand, two hundred seventy-two".