21035225523 has 8 divisors (see below), whose sum is σ = 30204426448. Its totient is φ = 12944754144.

The previous prime is 21035225509. The next prime is 21035225531. The reversal of 21035225523 is 32552253012.

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

It is not a de Polignac number, because 21035225523 - 2⁴ = 21035225507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035225503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269682340 + ... + 269682417.

It is an arithmetic number, because the mean of its divisors is an integer number (3775553306).

Almost surely, 2^21035225523 is an apocalyptic number.

21035225523 is a deficient number, since it is larger than the sum of its proper divisors (9169200925).

21035225523 is a wasteful number, since it uses less digits than its factorization.

21035225523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539364773.

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21035225523 its reverse (32552253012), we get a palindrome (53587478535).

The spelling of 21035225523 in words is "twenty-one billion, thirty-five million, two hundred twenty-five thousand, five hundred twenty-three".