210506652121 has 4 divisors (see below), whose sum is σ = 210508398352. Its totient is φ = 210504905892.

The previous prime is 210506652077. The next prime is 210506652163. The reversal of 210506652121 is 121256605012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210506652121 - 2¹⁹ = 210506127833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210506652821) 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 3 ways as a sum of consecutive naturals, for example, 677715 + ... + 938248.

It is an arithmetic number, because the mean of its divisors is an integer number (52627099588).

Almost surely, 2^210506652121 is an apocalyptic number.

It is an amenable number.

210506652121 is a deficient number, since it is larger than the sum of its proper divisors (1746231).

210506652121 is a wasteful number, since it uses less digits than its factorization.

210506652121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746230.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 210506652121 in words is "two hundred ten billion, five hundred six million, six hundred fifty-two thousand, one hundred twenty-one".