21654200234007 has 12 divisors (see below), whose sum is σ = 34121770065864. Its totient is φ = 13123757717520.

The previous prime is 21654200233949. The next prime is 21654200234027. The reversal of 21654200234007 is 70043200245612.

21654200234007 is a `hidden beast` number, since 21 + 6 + 5 + 4 + 200 + 23 + 400 + 7 = 666.

It is not a de Polignac number, because 21654200234007 - 2¹⁵ = 21654200201239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21654200234027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109364647548 + ... + 109364647745.

It is an arithmetic number, because the mean of its divisors is an integer number (2843480838822).

Almost surely, 2^{21654200234007} is an apocalyptic number.

21654200234007 is a deficient number, since it is larger than the sum of its proper divisors (12467569831857).

21654200234007 is a wasteful number, since it uses less digits than its factorization.

21654200234007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218729295310 (or 218729295307 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

Adding to 21654200234007 its reverse (70043200245612), we get a palindrome (91697400479619).

The spelling of 21654200234007 in words is "twenty-one trillion, six hundred fifty-four billion, two hundred million, two hundred thirty-four thousand, seven".