210121211210221 has 8 divisors (see below), whose sum is σ = 226817499358080. Its totient is φ = 194054971671792.

The previous prime is 210121211210167. The next prime is 210121211210231. The reversal of 210121211210221 is 122012112121012.

It is a happy number.

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 210121211210221 - 2¹⁷ = 210121211079149 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 (210121211210231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157512151665 + ... + 157512152998.

It is an arithmetic number, because the mean of its divisors is an integer number (28352187419760).

Almost surely, 2^{210121211210221} is an apocalyptic number.

It is an amenable number.

210121211210221 is a deficient number, since it is larger than the sum of its proper divisors (16696288147859).

210121211210221 is a wasteful number, since it uses less digits than its factorization.

210121211210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315024304715.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210121211210221 its reverse (122012112121012), we get a palindrome (332133323331233).

The spelling of 210121211210221 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-one".