21542562500121 has 96 divisors (see below), whose sum is σ = 33979900840704. Its totient is φ = 13072466880000.

The previous prime is 21542562500033. The next prime is 21542562500141. The reversal of 21542562500121 is 12100526524512.

21542562500121 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 2 + 5 + 625 + 0 + 0 + 1 + 21 = 666.

It is not a de Polignac number, because 21542562500121 - 2¹¹ = 21542562498073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21542562500141) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7250945166 + ... + 7250948136.

It is an arithmetic number, because the mean of its divisors is an integer number (353957300424).

Almost surely, 2^{21542562500121} is an apocalyptic number.

It is an amenable number.

21542562500121 is a deficient number, since it is larger than the sum of its proper divisors (12437338340583).

21542562500121 is a wasteful number, since it uses less digits than its factorization.

21542562500121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375 (or 5372 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 21542562500121 in words is "twenty-one trillion, five hundred forty-two billion, five hundred sixty-two million, five hundred thousand, one hundred twenty-one".