21326404053 has 8 divisors (see below), whose sum is σ = 28440474400. Its totient is φ = 14214968208.

The previous prime is 21326404039. The next prime is 21326404067. The reversal of 21326404053 is 35040462312.

It is an interprime number because it is at equal distance from previous prime (21326404039) and next prime (21326404067).

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

It is not a de Polignac number, because 21326404053 - 2²⁵ = 21292849621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21326404053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322404053) 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, 639658 + ... + 672171.

It is an arithmetic number, because the mean of its divisors is an integer number (3555059300).

Almost surely, 2^21326404053 is an apocalyptic number.

It is an amenable number.

21326404053 is a deficient number, since it is larger than the sum of its proper divisors (7114070347).

21326404053 is a wasteful number, since it uses less digits than its factorization.

21326404053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317251.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21326404053 its reverse (35040462312), we get a palindrome (56366866365).

The spelling of 21326404053 in words is "twenty-one billion, three hundred twenty-six million, four hundred four thousand, fifty-three".