21321364435 has 32 divisors (see below), whose sum is σ = 31087825920. Its totient is φ = 13720806528.

The previous prime is 21321364423. The next prime is 21321364451. The reversal of 21321364435 is 53446312312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21321364435 - 2⁷ = 21321364307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321364435.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207205 + ... + 292534.

It is an arithmetic number, because the mean of its divisors is an integer number (971494560).

Almost surely, 2^21321364435 is an apocalyptic number.

21321364435 is a deficient number, since it is larger than the sum of its proper divisors (9766461485).

21321364435 is a wasteful number, since it uses less digits than its factorization.

21321364435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499827.

The product of its digits is 51840, while the sum is 34.

Adding to 21321364435 its reverse (53446312312), we get a palindrome (74767676747).

The spelling of 21321364435 in words is "twenty-one billion, three hundred twenty-one million, three hundred sixty-four thousand, four hundred thirty-five".