1221222211201 has 4 divisors (see below), whose sum is σ = 1221481884672. Its totient is φ = 1220962537732.

The previous prime is 1221222211133. The next prime is 1221222211207. The reversal of 1221222211201 is 1021122221221.

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 a de Polignac number, because none of the positive numbers 2^k-1221222211201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221222211207) 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, 129829681 + ... + 129839086.

It is an arithmetic number, because the mean of its divisors is an integer number (305370471168).

Almost surely, 2^{1221222211201} is an apocalyptic number.

It is an amenable number.

1221222211201 is a deficient number, since it is larger than the sum of its proper divisors (259673471).

1221222211201 is an equidigital number, since it uses as much as digits as its factorization.

1221222211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259673470.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221222211201 its reverse (1021122221221), we get a palindrome (2242344432422).

The spelling of 1221222211201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred one".