2220212221121 has 4 divisors (see below), whose sum is σ = 2220346951044. Its totient is φ = 2220077491200.

The previous prime is 2220212221091. The next prime is 2220212221127. The reversal of 2220212221121 is 1211222120222.

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 1596846704896 + 623365516225 = 1263664^2 + 789535^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220212221121 - 2⁶ = 2220212221057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220212221093 and 2220212221102.

It is not an unprimeable number, because it can be changed into a prime (2220212221127) 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, 67340240 + ... + 67373201.

It is an arithmetic number, because the mean of its divisors is an integer number (555086737761).

Almost surely, 2^{2220212221121} is an apocalyptic number.

It is an amenable number.

2220212221121 is a deficient number, since it is larger than the sum of its proper divisors (134729923).

2220212221121 is a wasteful number, since it uses less digits than its factorization.

2220212221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134729922.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2220212221121 its reverse (1211222120222), we get a palindrome (3431434341343).

The spelling of 2220212221121 in words is "two trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twenty-one".