101121220121 has 4 divisors (see below), whose sum is σ = 101181809700. Its totient is φ = 101060630544.

The previous prime is 101121220103. The next prime is 101121220129. The reversal of 101121220121 is 121022121101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26810460121 + 74310760000 = 163739^2 + 272600^2 .

It is a cyclic number.

It is not a de Polignac number, because 101121220121 - 2²² = 101117025817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101121220096 and 101121220105.

It is not an unprimeable number, because it can be changed into a prime (101121220129) 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, 30292286 + ... + 30295623.

It is an arithmetic number, because the mean of its divisors is an integer number (25295452425).

Almost surely, 2^101121220121 is an apocalyptic number.

It is an amenable number.

101121220121 is a deficient number, since it is larger than the sum of its proper divisors (60589579).

101121220121 is an equidigital number, since it uses as much as digits as its factorization.

101121220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60589578.

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

Adding to 101121220121 its reverse (121022121101), we get a palindrome (222143341222).

The spelling of 101121220121 in words is "one hundred one billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".