210121120121 has 4 divisors (see below), whose sum is σ = 229223040144. Its totient is φ = 191019200100.

The previous prime is 210121120117. The next prime is 210121120159. The reversal of 210121120121 is 121021121012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210121120121 - 2² = 210121120117 is a prime.

It is a super-2 number, since 2×210121120121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210121120096 and 210121120105.

It is not an unprimeable number, because it can be changed into a prime (210121128121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9550959995 + ... + 9550960016.

It is an arithmetic number, because the mean of its divisors is an integer number (57305760036).

Almost surely, 2^210121120121 is an apocalyptic number.

It is an amenable number.

210121120121 is a deficient number, since it is larger than the sum of its proper divisors (19101920023).

210121120121 is a wasteful number, since it uses less digits than its factorization.

210121120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19101920022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210121120121 its reverse (121021121012), we get a palindrome (331142241133).

The spelling of 210121120121 in words is "two hundred ten billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".