21152166410405 has 16 divisors (see below), whose sum is σ = 26887445544960. Its totient is φ = 15919373060352.

The previous prime is 21152166410393. The next prime is 21152166410513. The reversal of 21152166410405 is 50401466125112.

It is a cyclic number.

It is not a de Polignac number, because 21152166410405 - 2¹² = 21152166406309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54210725 + ... + 54599514.

It is an arithmetic number, because the mean of its divisors is an integer number (1680465346560).

Almost surely, 2^{21152166410405} is an apocalyptic number.

It is an amenable number.

21152166410405 is a deficient number, since it is larger than the sum of its proper divisors (5735279134555).

21152166410405 is a wasteful number, since it uses less digits than its factorization.

21152166410405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108812548.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 21152166410405 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred sixty-six million, four hundred ten thousand, four hundred five".