21136026353 has 8 divisors (see below), whose sum is σ = 22963308648. Its totient is φ = 19337520384.

The previous prime is 21136026337. The next prime is 21136026361. The reversal of 21136026353 is 35362063112.

It can be written as a sum of positive squares in 4 ways, for example, as 1128489649 + 20007536704 = 33593^2 + 141448^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21136026353 - 2⁴ = 21136026337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21136026313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7192550 + ... + 7195487.

It is an arithmetic number, because the mean of its divisors is an integer number (2870413581).

Almost surely, 2^21136026353 is an apocalyptic number.

It is an amenable number.

21136026353 is a deficient number, since it is larger than the sum of its proper divisors (1827282295).

21136026353 is a wasteful number, since it uses less digits than its factorization.

21136026353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14388163.

The product of its (nonzero) digits is 19440, while the sum is 32.

Adding to 21136026353 its reverse (35362063112), we get a palindrome (56498089465).

The spelling of 21136026353 in words is "twenty-one billion, one hundred thirty-six million, twenty-six thousand, three hundred fifty-three".