21654236234 has 16 divisors (see below), whose sum is σ = 34410485448. Its totient is φ = 10184758272.

The previous prime is 21654236221. The next prime is 21654236239. The reversal of 21654236234 is 43263245612.

It can be written as a sum of positive squares in 4 ways, for example, as 17525788225 + 4128448009 = 132385^2 + 64253^2 .

It is not an unprimeable number, because it can be changed into a prime (21654236239) 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, 106337 + ... + 233700.

Almost surely, 2^21654236234 is an apocalyptic number.

21654236234 is a deficient number, since it is larger than the sum of its proper divisors (12756249214).

21654236234 is a wasteful number, since it uses less digits than its factorization.

21654236234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341929.

The product of its digits is 207360, while the sum is 38.

The spelling of 21654236234 in words is "twenty-one billion, six hundred fifty-four million, two hundred thirty-six thousand, two hundred thirty-four".