101220112121 has 4 divisors (see below), whose sum is σ = 101750060544. Its totient is φ = 100690163700.

The previous prime is 101220112073. The next prime is 101220112151. The reversal of 101220112121 is 121211022101.

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 a de Polignac number, because none of the positive numbers 2^k-101220112121 is a prime.

It is a super-2 number, since 2×101220112121² (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 = 101220112096 and 101220112105.

It is not an unprimeable number, because it can be changed into a prime (101220112151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264973925 + ... + 264974306.

It is an arithmetic number, because the mean of its divisors is an integer number (25437515136).

Almost surely, 2^101220112121 is an apocalyptic number.

It is an amenable number.

101220112121 is a deficient number, since it is larger than the sum of its proper divisors (529948423).

101220112121 is an equidigital number, since it uses as much as digits as its factorization.

101220112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529948422.

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

Adding to 101220112121 its reverse (121211022101), we get a palindrome (222431134222).

The spelling of 101220112121 in words is "one hundred one billion, two hundred twenty million, one hundred twelve thousand, one hundred twenty-one".