21420230234 has 32 divisors (see below), whose sum is σ = 36139461120. Its totient is φ = 9447748992.

The previous prime is 21420230189. The next prime is 21420230263. The reversal of 21420230234 is 43203202412.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659279 + ... + 691005.

It is an arithmetic number, because the mean of its divisors is an integer number (1129358160).

Almost surely, 2^21420230234 is an apocalyptic number.

21420230234 is a deficient number, since it is larger than the sum of its proper divisors (14719230886).

21420230234 is a wasteful number, since it uses less digits than its factorization.

21420230234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32894.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21420230234 its reverse (43203202412), we get a palindrome (64623432646).

The spelling of 21420230234 in words is "twenty-one billion, four hundred twenty million, two hundred thirty thousand, two hundred thirty-four".