13521023444 has 12 divisors (see below), whose sum is σ = 23745403584. Its totient is φ = 6736622424.

The previous prime is 13521023441. The next prime is 13521023531. The reversal of 13521023444 is 44432012531.

It is a super-2 number, since 2×13521023444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521023441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5971052 + ... + 5973315.

It is an arithmetic number, because the mean of its divisors is an integer number (1978783632).

Almost surely, 2^13521023444 is an apocalyptic number.

It is an amenable number.

13521023444 is a deficient number, since it is larger than the sum of its proper divisors (10224380140).

13521023444 is a wasteful number, since it uses less digits than its factorization.

13521023444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11944654 (or 11944652 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 13521023444 its reverse (44432012531), we get a palindrome (57953035975).

The spelling of 13521023444 in words is "thirteen billion, five hundred twenty-one million, twenty-three thousand, four hundred forty-four".