210121200012021 has 32 divisors (see below), whose sum is σ = 288198693242880. Its totient is φ = 136105629416064.

The previous prime is 210121200011959. The next prime is 210121200012023. The reversal of 210121200012021 is 120210002121012.

It is not a de Polignac number, because 210121200012021 - 2³⁷ = 209983761058549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121200012023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 325667886 + ... + 326312448.

It is an arithmetic number, because the mean of its divisors is an integer number (9006209163840).

Almost surely, 2^{210121200012021} is an apocalyptic number.

It is an amenable number.

210121200012021 is a deficient number, since it is larger than the sum of its proper divisors (78077493230859).

210121200012021 is a wasteful number, since it uses less digits than its factorization.

210121200012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661385.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210121200012021 its reverse (120210002121012), we get a palindrome (330331202133033).

The spelling of 210121200012021 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred million, twelve thousand, twenty-one".