21123633632113 has 16 divisors (see below), whose sum is σ = 21851657283456. Its totient is φ = 20405793893760.

The previous prime is 21123633632077. The next prime is 21123633632117. The reversal of 21123633632113 is 31123633632112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21123633632113 - 2⁹ = 21123633631601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123633632117) 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, 33969970 + ... + 34586212.

It is an arithmetic number, because the mean of its divisors is an integer number (1365728580216).

Almost surely, 2^{21123633632113} is an apocalyptic number.

It is an amenable number.

21123633632113 is a deficient number, since it is larger than the sum of its proper divisors (728023651343).

21123633632113 is a wasteful number, since it uses less digits than its factorization.

21123633632113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624504.

The product of its digits is 69984, while the sum is 37.

Subtracting 21123633632113 from its reverse (31123633632112), we obtain a palindrome (9999999999999).

The spelling of 21123633632113 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred thirty-three million, six hundred thirty-two thousand, one hundred thirteen".