21352013044 has 6 divisors (see below), whose sum is σ = 37366022834. Its totient is φ = 10676006520.

The previous prime is 21352013029. The next prime is 21352013047. The reversal of 21352013044 is 44031025312.

It can be written as a sum of positive squares in only one way, i.e., 14820140644 + 6531872400 = 121738^2 + 80820^2 .

It is a super-2 number, since 2×21352013044² (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 (21352013047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669001627 + ... + 2669001634.

Almost surely, 2^21352013044 is an apocalyptic number.

It is an amenable number.

21352013044 is a deficient number, since it is larger than the sum of its proper divisors (16014009790).

21352013044 is a wasteful number, since it uses less digits than its factorization.

21352013044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338003265 (or 5338003263 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21352013044 its reverse (44031025312), we get a palindrome (65383038356).

The spelling of 21352013044 in words is "twenty-one billion, three hundred fifty-two million, thirteen thousand, forty-four".