2221210220121 has 24 divisors (see below), whose sum is σ = 3575942154720. Its totient is φ = 1320347869056.

The previous prime is 2221210220093. The next prime is 2221210220137. The reversal of 2221210220121 is 1210220121222.

It is a happy number.

2221210220121 is a `hidden beast` number, since 2 + 221 + 210 + 220 + 12 + 1 = 666.

It is not a de Polignac number, because 2221210220121 - 2⁹ = 2221210219609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221210220094 and 2221210220103.

It is not an unprimeable number, because it can be changed into a prime (2221210220191) 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, 382042195 + ... + 382048008.

It is an arithmetic number, because the mean of its divisors is an integer number (148997589780).

Almost surely, 2^{2221210220121} is an apocalyptic number.

It is an amenable number.

2221210220121 is a deficient number, since it is larger than the sum of its proper divisors (1354731934599).

2221210220121 is a wasteful number, since it uses less digits than its factorization.

2221210220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764090245 (or 764090242 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221210220121 its reverse (1210220121222), we get a palindrome (3431430341343).

It can be divided in two parts, 222 and 1210220121, that multiplied together give a palindrome (268668866862).

The spelling of 2221210220121 in words is "two trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, one hundred twenty-one".