21654138333 has 16 divisors (see below), whose sum is σ = 29089589760. Its totient is φ = 14327655216.

The previous prime is 21654138281. The next prime is 21654138347. The reversal of 21654138333 is 33383145612.

It is not a de Polignac number, because 21654138333 - 2⁶ = 21654138269 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21654138291 and 21654138300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654138533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297366 + ... + 362952.

It is an arithmetic number, because the mean of its divisors is an integer number (1818099360).

Almost surely, 2^21654138333 is an apocalyptic number.

It is an amenable number.

21654138333 is a deficient number, since it is larger than the sum of its proper divisors (7435451427).

21654138333 is a wasteful number, since it uses less digits than its factorization.

21654138333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66416.

The product of its digits is 155520, while the sum is 39.

The spelling of 21654138333 in words is "twenty-one billion, six hundred fifty-four million, one hundred thirty-eight thousand, three hundred thirty-three".