210121010121 has 32 divisors (see below), whose sum is σ = 310197768192. Its totient is φ = 125455887360.

The previous prime is 210121010111. The next prime is 210121010147. The reversal of 210121010121 is 121010121012.

210121010121 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 210121010121 - 2¹⁰ = 210121009097 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 210121010097 and 210121010106.

It is not an unprimeable number, because it can be changed into a prime (210121010111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495856 + ... + 816158.

It is an arithmetic number, because the mean of its divisors is an integer number (9693680256).

Almost surely, 2^210121010121 is an apocalyptic number.

It is an amenable number.

210121010121 is a deficient number, since it is larger than the sum of its proper divisors (100076758071).

210121010121 is a wasteful number, since it uses less digits than its factorization.

210121010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320613.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210121010121 its reverse (121010121012), we get a palindrome (331131131133).

The spelling of 210121010121 in words is "two hundred ten billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".