1221112221201 has 10 divisors (see below), whose sum is σ = 1824130602162. Its totient is φ = 814074814080.

The previous prime is 1221112221193. The next prime is 1221112221223. The reversal of 1221112221201 is 1021222111221.

It can be written as a sum of positive squares in only one way, i.e., 1029005331201 + 192106890000 = 1014399^2 + 438300^2 .

It is not a de Polignac number, because 1221112221201 - 2³ = 1221112221193 is a prime.

It is a super-2 number, since 2×1221112221201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221132221201) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7537729680 + ... + 7537729841.

Almost surely, 2^{1221112221201} is an apocalyptic number.

It is an amenable number.

1221112221201 is a deficient number, since it is larger than the sum of its proper divisors (603018380961).

1221112221201 is an equidigital number, since it uses as much as digits as its factorization.

1221112221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075459533 (or 15075459524 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221112221201 its reverse (1021222111221), we get a palindrome (2242334332422).

The spelling of 1221112221201 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred one".