21432302011 has 4 divisors (see below), whose sum is σ = 22123666624. Its totient is φ = 20740937400.

The previous prime is 21432302009. The next prime is 21432302051. The reversal of 21432302011 is 11020323412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21432302011 - 2¹ = 21432302009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21432302011.

It is not an unprimeable number, because it can be changed into a prime (21432302051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345682260 + ... + 345682321.

It is an arithmetic number, because the mean of its divisors is an integer number (5530916656).

Almost surely, 2^21432302011 is an apocalyptic number.

21432302011 is a deficient number, since it is larger than the sum of its proper divisors (691364613).

21432302011 is an equidigital number, since it uses as much as digits as its factorization.

21432302011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691364612.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21432302011 its reverse (11020323412), we get a palindrome (32452625423).

The spelling of 21432302011 in words is "twenty-one billion, four hundred thirty-two million, three hundred two thousand, eleven".