21013223234 has 16 divisors (see below), whose sum is σ = 32062055040. Its totient is φ = 10325960400.

The previous prime is 21013223221. The next prime is 21013223263. The reversal of 21013223234 is 43232231012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 506684 + ... + 546584.

It is an arithmetic number, because the mean of its divisors is an integer number (2003878440).

Almost surely, 2^21013223234 is an apocalyptic number.

21013223234 is a deficient number, since it is larger than the sum of its proper divisors (11048831806).

21013223234 is a wasteful number, since it uses less digits than its factorization.

21013223234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44425.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21013223234 its reverse (43232231012), we get a palindrome (64245454246).

The spelling of 21013223234 in words is "twenty-one billion, thirteen million, two hundred twenty-three thousand, two hundred thirty-four".