21434233205 has 32 divisors (see below), whose sum is σ = 32750161920. Its totient is φ = 13077299520.

The previous prime is 21434233201. The next prime is 21434233211. The reversal of 21434233205 is 50233243412.

It is a happy number.

It is not a de Polignac number, because 21434233205 - 2² = 21434233201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434233201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 574175 + ... + 610364.

It is an arithmetic number, because the mean of its divisors is an integer number (1023442560).

Almost surely, 2^21434233205 is an apocalyptic number.

It is an amenable number.

21434233205 is a deficient number, since it is larger than the sum of its proper divisors (11315928715).

21434233205 is a wasteful number, since it uses less digits than its factorization.

21434233205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184609.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 21434233205 its reverse (50233243412), we get a palindrome (71667476617).

The spelling of 21434233205 in words is "twenty-one billion, four hundred thirty-four million, two hundred thirty-three thousand, two hundred five".