21234054136 has 16 divisors (see below), whose sum is σ = 42155843040. Its totient is φ = 9992496000.

The previous prime is 21234054131. The next prime is 21234054161. The reversal of 21234054136 is 63145043212.

It is a junction number, because it is equal to n+sod(n) for n = 21234054098 and 21234054107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234054131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78066240 + ... + 78066511.

It is an arithmetic number, because the mean of its divisors is an integer number (2634740190).

Almost surely, 2^21234054136 is an apocalyptic number.

It is an amenable number.

21234054136 is a deficient number, since it is larger than the sum of its proper divisors (20921788904).

21234054136 is a wasteful number, since it uses less digits than its factorization.

21234054136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156132774 (or 156132770 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21234054136 its reverse (63145043212), we get a palindrome (84379097348).

The spelling of 21234054136 in words is "twenty-one billion, two hundred thirty-four million, fifty-four thousand, one hundred thirty-six".