210121210221021 has 32 divisors (see below), whose sum is σ = 340998921267840. Its totient is φ = 126817780550400.

The previous prime is 210121210221011. The next prime is 210121210221023. The reversal of 210121210221021 is 120122012121012.

210121210221021 is a `hidden beast` number, since 210 + 1 + 2 + 1 + 210 + 221 + 0 + 21 = 666.

210121210221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210121210221021 - 2¹⁰ = 210121210219997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210121210220985 and 210121210221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210121210221023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1467726810 + ... + 1467869963.

It is an arithmetic number, because the mean of its divisors is an integer number (10656216289620).

Almost surely, 2^{210121210221021} is an apocalyptic number.

It is an amenable number.

210121210221021 is a deficient number, since it is larger than the sum of its proper divisors (130877711046819).

210121210221021 is a wasteful number, since it uses less digits than its factorization.

210121210221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935597034 (or 2935597028 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210121210221021 its reverse (120122012121012), we get a palindrome (330243222342033).

The spelling of 210121210221021 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, twenty-one".