21004045535 has 16 divisors (see below), whose sum is σ = 27619522560. Its totient is φ = 15207159840.

The previous prime is 21004045529. The next prime is 21004045583. The reversal of 21004045535 is 53554040012.

It is not a de Polignac number, because 21004045535 - 2⁶ = 21004045471 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21004045498 and 21004045507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843995 + ... + 868524.

It is an arithmetic number, because the mean of its divisors is an integer number (1726220160).

Almost surely, 2^21004045535 is an apocalyptic number.

21004045535 is a deficient number, since it is larger than the sum of its proper divisors (6615477025).

21004045535 is a wasteful number, since it uses less digits than its factorization.

21004045535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712758.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 21004045535 its reverse (53554040012), we get a palindrome (74558085547).

The spelling of 21004045535 in words is "twenty-one billion, four million, forty-five thousand, five hundred thirty-five".