210120011221 has 4 divisors (see below), whose sum is σ = 221178959200. Its totient is φ = 199061063244.

The previous prime is 210120011201. The next prime is 210120011263. The reversal of 210120011221 is 122110021012.

210120011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210120011221 - 2¹³ = 210120003029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120011201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5529473961 + ... + 5529473998.

It is an arithmetic number, because the mean of its divisors is an integer number (55294739800).

Almost surely, 2^210120011221 is an apocalyptic number.

It is an amenable number.

210120011221 is a deficient number, since it is larger than the sum of its proper divisors (11058947979).

210120011221 is a wasteful number, since it uses less digits than its factorization.

210120011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11058947978.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210120011221 its reverse (122110021012), we get a palindrome (332230032233).

The spelling of 210120011221 in words is "two hundred ten billion, one hundred twenty million, eleven thousand, two hundred twenty-one".