21323115435 has 32 divisors (see below), whose sum is σ = 34418792448. Its totient is φ = 11272060800.

The previous prime is 21323115433. The next prime is 21323115479. The reversal of 21323115435 is 53451132312.

It is not a de Polignac number, because 21323115435 - 2¹ = 21323115433 is a prime.

It is a super-3 number, since 3×21323115435³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21323115433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1038529 + ... + 1058861.

It is an arithmetic number, because the mean of its divisors is an integer number (1075587264).

Almost surely, 2^21323115435 is an apocalyptic number.

21323115435 is a deficient number, since it is larger than the sum of its proper divisors (13095677013).

21323115435 is a wasteful number, since it uses less digits than its factorization.

21323115435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20955.

The product of its digits is 10800, while the sum is 30.

Adding to 21323115435 its reverse (53451132312), we get a palindrome (74774247747).

The spelling of 21323115435 in words is "twenty-one billion, three hundred twenty-three million, one hundred fifteen thousand, four hundred thirty-five".