121212210101 has 24 divisors (see below), whose sum is σ = 126755280000. Its totient is φ = 115874751552.

The previous prime is 121212210089. The next prime is 121212210103. The reversal of 121212210101 is 101012212121.

It is not a de Polignac number, because 121212210101 - 2⁶ = 121212210037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212210103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26070425 + ... + 26075073.

It is an arithmetic number, because the mean of its divisors is an integer number (5281470000).

Almost surely, 2^121212210101 is an apocalyptic number.

It is an amenable number.

121212210101 is a deficient number, since it is larger than the sum of its proper divisors (5543069899).

121212210101 is an equidigital number, since it uses as much as digits as its factorization.

121212210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5033 (or 4990 counting only the distinct ones).

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

Adding to 121212210101 its reverse (101012212121), we get a palindrome (222224422222).

It can be divided in two parts, 12121 and 2210101, that added together give a palindrome (2222222).

The spelling of 121212210101 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred one".