2100120221221 has 16 divisors (see below), whose sum is σ = 2295512110080. Its totient is φ = 1905475268080.

The previous prime is 2100120221219. The next prime is 2100120221257. The reversal of 2100120221221 is 1221220210012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2100120221221 - 2¹ = 2100120221219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100120221195 and 2100120221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120221281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27462180 + ... + 27538546.

It is an arithmetic number, because the mean of its divisors is an integer number (143469506880).

Almost surely, 2^{2100120221221} is an apocalyptic number.

It is an amenable number.

2100120221221 is a deficient number, since it is larger than the sum of its proper divisors (195391888859).

2100120221221 is a wasteful number, since it uses less digits than its factorization.

2100120221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81224.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2100120221221 its reverse (1221220210012), we get a palindrome (3321340431233).

The spelling of 2100120221221 in words is "two trillion, one hundred billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty-one".