21120410234 has 16 divisors (see below), whose sum is σ = 39497910336. Its totient is φ = 8228731200.

The previous prime is 21120410221. The next prime is 21120410239. The reversal of 21120410234 is 43201402112.

It is not an unprimeable number, because it can be changed into a prime (21120410239) 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, 68572607 + ... + 68572914.

It is an arithmetic number, because the mean of its divisors is an integer number (2468619396).

Almost surely, 2^21120410234 is an apocalyptic number.

21120410234 is a deficient number, since it is larger than the sum of its proper divisors (18377500102).

21120410234 is a wasteful number, since it uses less digits than its factorization.

21120410234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137145541.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21120410234 its reverse (43201402112), we get a palindrome (64321812346).

The spelling of 21120410234 in words is "twenty-one billion, one hundred twenty million, four hundred ten thousand, two hundred thirty-four".