1221112220001 has 8 divisors (see below), whose sum is σ = 1672153670784. Its totient is φ = 792072791280.

The previous prime is 1221112219993. The next prime is 1221112220093. The reversal of 1221112220001 is 1000222111221.

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

It is not a de Polignac number, because 1221112220001 - 2³ = 1221112219993 is a prime.

It is a super-2 number, since 2×1221112220001² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221112240001) 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, 5500505385 + ... + 5500505606.

It is an arithmetic number, because the mean of its divisors is an integer number (209019208848).

Almost surely, 2^{1221112220001} is an apocalyptic number.

It is an amenable number.

1221112220001 is a deficient number, since it is larger than the sum of its proper divisors (451041450783).

1221112220001 is a wasteful number, since it uses less digits than its factorization.

1221112220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11001011031.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221112220001 its reverse (1000222111221), we get a palindrome (2221334331222).

The spelling of 1221112220001 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one".