101200212121 has 4 divisors (see below), whose sum is σ = 101201047732. Its totient is φ = 101199376512.

The previous prime is 101200212119. The next prime is 101200212133. The reversal of 101200212121 is 121212002101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121212002101 = 33851 ⋅3580751.

It can be written as a sum of positive squares in 2 ways, for example, as 38732208025 + 62468004096 = 196805^2 + 249936^2 .

It is a cyclic number.

It is not a de Polignac number, because 101200212121 - 2¹ = 101200212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101200218121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197376 + ... + 491281.

It is an arithmetic number, because the mean of its divisors is an integer number (25300261933).

Almost surely, 2^101200212121 is an apocalyptic number.

It is an amenable number.

101200212121 is a deficient number, since it is larger than the sum of its proper divisors (835611).

101200212121 is an equidigital number, since it uses as much as digits as its factorization.

101200212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835610.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101200212121 its reverse (121212002101), we get a palindrome (222412214222).

The spelling of 101200212121 in words is "one hundred one billion, two hundred million, two hundred twelve thousand, one hundred twenty-one".