21116012154623 has 2 divisors, whose sum is σ = 21116012154624. Its totient is φ = 21116012154622.

The previous prime is 21116012154613. The next prime is 21116012154689. The reversal of 21116012154623 is 32645121061112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21116012154623 - 2²⁶ = 21115945045759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116012154613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10558006077311 + 10558006077312.

It is an arithmetic number, because the mean of its divisors is an integer number (10558006077312).

Almost surely, 2^{21116012154623} is an apocalyptic number.

21116012154623 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116012154623 is an equidigital number, since it uses as much as digits as its factorization.

21116012154623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 21116012154623 in words is "twenty-one trillion, one hundred sixteen billion, twelve million, one hundred fifty-four thousand, six hundred twenty-three".