21011344535 has 4 divisors (see below), whose sum is σ = 25213613448. Its totient is φ = 16809075624.

The previous prime is 21011344499. The next prime is 21011344559. The reversal of 21011344535 is 53544311012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011344535 - 2¹⁶ = 21011278999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011344498 and 21011344507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101134449 + ... + 2101134458.

It is an arithmetic number, because the mean of its divisors is an integer number (6303403362).

Almost surely, 2^21011344535 is an apocalyptic number.

21011344535 is a deficient number, since it is larger than the sum of its proper divisors (4202268913).

21011344535 is an equidigital number, since it uses as much as digits as its factorization.

21011344535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202268912.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21011344535 its reverse (53544311012), we get a palindrome (74555655547).

The spelling of 21011344535 in words is "twenty-one billion, eleven million, three hundred forty-four thousand, five hundred thirty-five".