1221221102001 has 4 divisors (see below), whose sum is σ = 1628294802672. Its totient is φ = 814147401332.

The previous prime is 1221221101873. The next prime is 1221221102011. The reversal of 1221221102001 is 1002011221221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221221102001 - 2⁷ = 1221221101873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221221102011) 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, 203536850331 + ... + 203536850336.

It is an arithmetic number, because the mean of its divisors is an integer number (407073700668).

Almost surely, 2^{1221221102001} is an apocalyptic number.

It is an amenable number.

1221221102001 is a deficient number, since it is larger than the sum of its proper divisors (407073700671).

1221221102001 is an equidigital number, since it uses as much as digits as its factorization.

1221221102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407073700670.

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

Adding to 1221221102001 its reverse (1002011221221), we get a palindrome (2223232323222).

The spelling of 1221221102001 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, one".