21421103234 has 16 divisors (see below), whose sum is σ = 33827647680. Its totient is φ = 10145382480.

The previous prime is 21421103203. The next prime is 21421103237. The reversal of 21421103234 is 43230112412.

It is not an unprimeable number, because it can be changed into a prime (21421103237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256124 + ... + 329304.

It is an arithmetic number, because the mean of its divisors is an integer number (2114227980).

Almost surely, 2^21421103234 is an apocalyptic number.

21421103234 is a deficient number, since it is larger than the sum of its proper divisors (12406544446).

21421103234 is a wasteful number, since it uses less digits than its factorization.

21421103234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80905.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21421103234 its reverse (43230112412), we get a palindrome (64651215646).

The spelling of 21421103234 in words is "twenty-one billion, four hundred twenty-one million, one hundred three thousand, two hundred thirty-four".