2220121221001 has 8 divisors (see below), whose sum is σ = 2222479471784. Its totient is φ = 2217763376640.

The previous prime is 2220121220987. The next prime is 2220121221037. The reversal of 2220121221001 is 1001221210222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1347802580601 + 872318640400 = 1160949^2 + 933980^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2220121221001 - 2⁵ = 2220121220969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2220121222001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11533021 + ... + 11723941.

It is an arithmetic number, because the mean of its divisors is an integer number (277809933973).

Almost surely, 2^{2220121221001} is an apocalyptic number.

It is an amenable number.

2220121221001 is a deficient number, since it is larger than the sum of its proper divisors (2358250783).

2220121221001 is a wasteful number, since it uses less digits than its factorization.

2220121221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203211.

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

Adding to 2220121221001 its reverse (1001221210222), we get a palindrome (3221342431223).

The spelling of 2220121221001 in words is "two trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty-one thousand, one".