210021011221 has 8 divisors (see below), whose sum is σ = 240026824640. Its totient is φ = 180015900768.

The previous prime is 210021011201. The next prime is 210021011231. The reversal of 210021011221 is 122110120012.

210021011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210021011221 - 2¹³ = 210021003029 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 (210021011201) 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 7 ways as a sum of consecutive naturals, for example, 919705 + ... + 1125121.

It is an arithmetic number, because the mean of its divisors is an integer number (30003353080).

Almost surely, 2^210021011221 is an apocalyptic number.

It is an amenable number.

210021011221 is a deficient number, since it is larger than the sum of its proper divisors (30005813419).

210021011221 is a wasteful number, since it uses less digits than its factorization.

210021011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351483.

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

Adding to 210021011221 its reverse (122110120012), we get a palindrome (332131131233).

The spelling of 210021011221 in words is "two hundred ten billion, twenty-one million, eleven thousand, two hundred twenty-one".