210221200000121 has 4 divisors (see below), whose sum is σ = 210384035942544. Its totient is φ = 210058364057700.

The previous prime is 210221200000093. The next prime is 210221200000271. The reversal of 210221200000121 is 121000002122012.

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 210221200000121 - 2¹⁸ = 210221199737977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221200000096 and 210221200000105.

It is not an unprimeable number, because it can be changed into a prime (210221200006121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81417969275 + ... + 81417971856.

It is an arithmetic number, because the mean of its divisors is an integer number (52596008985636).

Almost surely, 2^{210221200000121} is an apocalyptic number.

It is an amenable number.

210221200000121 is a deficient number, since it is larger than the sum of its proper divisors (162835942423).

210221200000121 is a wasteful number, since it uses less digits than its factorization.

210221200000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162835942422.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210221200000121 its reverse (121000002122012), we get a palindrome (331221202122133).

The spelling of 210221200000121 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred million, one hundred twenty-one", and thus it is an aban number.