21252411435 has 16 divisors (see below), whose sum is σ = 34645441824. Its totient is φ = 11120758272.

The previous prime is 21252411431. The next prime is 21252411437. The reversal of 21252411435 is 53411425212.

It is not a de Polignac number, because 21252411435 - 2² = 21252411431 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252411431) 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 15 ways as a sum of consecutive naturals, for example, 13365502 + ... + 13367091.

It is an arithmetic number, because the mean of its divisors is an integer number (2165340114).

Almost surely, 2^21252411435 is an apocalyptic number.

21252411435 is a deficient number, since it is larger than the sum of its proper divisors (13393030389).

21252411435 is a wasteful number, since it uses less digits than its factorization.

21252411435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26732654.

The product of its digits is 9600, while the sum is 30.

Adding to 21252411435 its reverse (53411425212), we get a palindrome (74663836647).

The spelling of 21252411435 in words is "twenty-one billion, two hundred fifty-two million, four hundred eleven thousand, four hundred thirty-five".