21035223505 has 8 divisors (see below), whose sum is σ = 26339758272. Its totient is φ = 16096518768.

The previous prime is 21035223499. The next prime is 21035223523. The reversal of 21035223505 is 50532253012.

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

It is a cyclic number.

It is not a de Polignac number, because 21035223505 - 2²⁷ = 20901005777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91457379 + ... + 91457608.

It is an arithmetic number, because the mean of its divisors is an integer number (3292469784).

Almost surely, 2^21035223505 is an apocalyptic number.

It is an amenable number.

21035223505 is a deficient number, since it is larger than the sum of its proper divisors (5304534767).

21035223505 is a wasteful number, since it uses less digits than its factorization.

21035223505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182915015.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 21035223505 its reverse (50532253012), we get a palindrome (71567476517).

The spelling of 21035223505 in words is "twenty-one billion, thirty-five million, two hundred twenty-three thousand, five hundred five".