1221222100201 has 4 divisors (see below), whose sum is σ = 1285496947600. Its totient is φ = 1156947252804.

The previous prime is 1221222100093. The next prime is 1221222100243. The reversal of 1221222100201 is 1020012221221.

It is a happy number.

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 1221222100201 - 2³³ = 1212632165609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221222100801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32137423671 + ... + 32137423708.

It is an arithmetic number, because the mean of its divisors is an integer number (321374236900).

Almost surely, 2^{1221222100201} is an apocalyptic number.

It is an amenable number.

1221222100201 is a deficient number, since it is larger than the sum of its proper divisors (64274847399).

1221222100201 is an equidigital number, since it uses as much as digits as its factorization.

1221222100201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64274847398.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1221222100201 its reverse (1020012221221), we get a palindrome (2241234321422).

The spelling of 1221222100201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred one".