21246134112655 has 8 divisors (see below), whose sum is σ = 25495390825632. Its totient is φ = 16996887363168.

The previous prime is 21246134112629. The next prime is 21246134112661. The reversal of 21246134112655 is 55621143164212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21246134112655 - 2⁹ = 21246134112143 is a prime.

It is a super-2 number, since 2×21246134112655² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3518337 + ... + 7407493.

It is an arithmetic number, because the mean of its divisors is an integer number (3186923853204).

Almost surely, 2^{21246134112655} is an apocalyptic number.

21246134112655 is a deficient number, since it is larger than the sum of its proper divisors (4249256712977).

21246134112655 is a wasteful number, since it uses less digits than its factorization.

21246134112655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981745.

The product of its digits is 345600, while the sum is 43.

Adding to 21246134112655 its reverse (55621143164212), we get a palindrome (76867277276867).

The spelling of 21246134112655 in words is "twenty-one trillion, two hundred forty-six billion, one hundred thirty-four million, one hundred twelve thousand, six hundred fifty-five".