211520725121 has 8 divisors (see below), whose sum is σ = 212070393000. Its totient is φ = 210971407360.

The previous prime is 211520725063. The next prime is 211520725177. The reversal of 211520725121 is 121527025112.

It can be written as a sum of positive squares in 4 ways, for example, as 14868388096 + 196652337025 = 121936^2 + 443455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 211520725121 - 2⁶ = 211520725057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211520725021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1144775 + ... + 1316643.

It is an arithmetic number, because the mean of its divisors is an integer number (26508799125).

Almost surely, 2^211520725121 is an apocalyptic number.

It is an amenable number.

211520725121 is a deficient number, since it is larger than the sum of its proper divisors (549667879).

211520725121 is a wasteful number, since it uses less digits than its factorization.

211520725121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175059.

The product of its (nonzero) digits is 2800, while the sum is 29.

The spelling of 211520725121 in words is "two hundred eleven billion, five hundred twenty million, seven hundred twenty-five thousand, one hundred twenty-one".