4401243521 has 4 divisors (see below), whose sum is σ = 4417484544. Its totient is φ = 4385002500.

The previous prime is 4401243439. The next prime is 4401243527. The reversal of 4401243521 is 1253421044.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4401243521 is a prime.

It is a super-2 number, since 2×4401243521² = 38741889062288954882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4401243527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8120105 + ... + 8120646.

It is an arithmetic number, because the mean of its divisors is an integer number (1104371136).

Almost surely, 2^4401243521 is an apocalyptic number.

It is an amenable number.

4401243521 is a deficient number, since it is larger than the sum of its proper divisors (16241023).

4401243521 is a wasteful number, since it uses less digits than its factorization.

4401243521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16241022.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 4401243521 is about 66341.8685371463. The cubic root of 4401243521 is about 1638.7968968436.

Adding to 4401243521 its reverse (1253421044), we get a palindrome (5654664565).

The spelling of 4401243521 in words is "four billion, four hundred one million, two hundred forty-three thousand, five hundred twenty-one".