1021222222001 has 6 divisors (see below), whose sum is σ = 1043412657330. Its totient is φ = 999494087456.

The previous prime is 1021222221997. The next prime is 1021222222003. The reversal of 1021222222001 is 1002222221201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 559019400976 + 462202821025 = 747676^2 + 679855^2 .

It is not a de Polignac number, because 1021222222001 - 2² = 1021222221997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021222222003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 231148136 + ... + 231152553.

It is an arithmetic number, because the mean of its divisors is an integer number (173902109555).

Almost surely, 2^{1021222222001} is an apocalyptic number.

It is an amenable number.

1021222222001 is a deficient number, since it is larger than the sum of its proper divisors (22190435329).

1021222222001 is an frugal number, since it uses more digits than its factorization.

1021222222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462300783 (or 462300736 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1021222222001 its reverse (1002222221201), we get a palindrome (2023444443202).

The spelling of 1021222222001 in words is "one trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one".