210121210202121 has 40 divisors (see below), whose sum is σ = 314317884957120. Its totient is φ = 139887529050528.

The previous prime is 210121210202119. The next prime is 210121210202159. The reversal of 210121210202121 is 121202012121012.

210121210202121 is a `hidden beast` number, since 2 + 10 + 121 + 210 + 202 + 121 = 666.

It is not a de Polignac number, because 210121210202121 - 2¹ = 210121210202119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210121210202094 and 210121210202103.

It is not an unprimeable number, because it can be changed into a prime (210121210402121) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3347286891 + ... + 3347349663.

It is an arithmetic number, because the mean of its divisors is an integer number (7857947123928).

Almost surely, 2^{210121210202121} is an apocalyptic number.

It is an amenable number.

210121210202121 is a deficient number, since it is larger than the sum of its proper divisors (104196674754999).

210121210202121 is an equidigital number, since it uses as much as digits as its factorization.

210121210202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119147 (or 119138 counting only the distinct ones).

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

Adding to 210121210202121 its reverse (121202012121012), we get a palindrome (331323222323133).

The spelling of 210121210202121 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred ten million, two hundred two thousand, one hundred twenty-one".