21001141244 has 48 divisors (see below), whose sum is σ = 39088810656. Its totient is φ = 9859449600.

The previous prime is 21001141243. The next prime is 21001141247. The reversal of 21001141244 is 44214110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001141241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456539 + ... + 500429.

It is an arithmetic number, because the mean of its divisors is an integer number (814350222).

Almost surely, 2^21001141244 is an apocalyptic number.

It is an amenable number.

21001141244 is a deficient number, since it is larger than the sum of its proper divisors (18087669412).

21001141244 is a wasteful number, since it uses less digits than its factorization.

21001141244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44046 (or 44044 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21001141244 its reverse (44214110012), we get a palindrome (65215251256).

The spelling of 21001141244 in words is "twenty-one billion, one million, one hundred forty-one thousand, two hundred forty-four".