21005776452115 has 128 divisors (see below), whose sum is σ = 32190612959232. Its totient is φ = 12803503749120.

The previous prime is 21005776452109. The next prime is 21005776452173. The reversal of 21005776452115 is 51125467750012.

It is a happy number.

It is not a de Polignac number, because 21005776452115 - 2⁷ = 21005776451987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4929774085 + ... + 4929778345.

It is an arithmetic number, because the mean of its divisors is an integer number (251489163744).

Almost surely, 2^{21005776452115} is an apocalyptic number.

21005776452115 is a deficient number, since it is larger than the sum of its proper divisors (11184836507117).

21005776452115 is a wasteful number, since it uses less digits than its factorization.

21005776452115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7269.

The product of its (nonzero) digits is 588000, while the sum is 46.

The spelling of 21005776452115 in words is "twenty-one trillion, five billion, seven hundred seventy-six million, four hundred fifty-two thousand, one hundred fifteen".