21235030265 has 8 divisors (see below), whose sum is σ = 25483316040. Its totient is φ = 16987171072.

The previous prime is 21235030237. The next prime is 21235030321. The reversal of 21235030265 is 56203053212.

It can be written as a sum of positive squares in 4 ways, for example, as 5325496576 + 15909533689 = 72976^2 + 126133^2 .

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 21235030265 - 2³² = 16940062969 is a prime.

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, 15617 + ... + 206673.

It is an arithmetic number, because the mean of its divisors is an integer number (3185414505).

Almost surely, 2^21235030265 is an apocalyptic number.

It is an amenable number.

21235030265 is a deficient number, since it is larger than the sum of its proper divisors (4248285775).

21235030265 is a wasteful number, since it uses less digits than its factorization.

21235030265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213291.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21235030265 its reverse (56203053212), we get a palindrome (77438083477).

The spelling of 21235030265 in words is "twenty-one billion, two hundred thirty-five million, thirty thousand, two hundred sixty-five".