215523125606121 has 16 divisors (see below), whose sum is σ = 299924793821184. Its totient is φ = 137404542735504.

The previous prime is 215523125606111. The next prime is 215523125606149. The reversal of 215523125606121 is 121606521325512.

It is a happy number.

It is not a de Polignac number, because 215523125606121 - 2⁷ = 215523125605993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215523125606101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346208161 + ... + 346830126.

It is an arithmetic number, because the mean of its divisors is an integer number (18745299613824).

Almost surely, 2^{215523125606121} is an apocalyptic number.

It is an amenable number.

215523125606121 is a deficient number, since it is larger than the sum of its proper divisors (84401668215063).

215523125606121 is a wasteful number, since it uses less digits than its factorization.

215523125606121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693042820.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 215523125606121 in words is "two hundred fifteen trillion, five hundred twenty-three billion, one hundred twenty-five million, six hundred six thousand, one hundred twenty-one".