1221002122201 has 4 divisors (see below), whose sum is σ = 1221006246372. Its totient is φ = 1220997998032.

The previous prime is 1221002122183. The next prime is 1221002122231. The reversal of 1221002122201 is 1022212001221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 231327331225 + 989674790976 = 480965^2 + 994824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221002122201 - 2¹⁹ = 1221001597913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221002122231) 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, 1580506 + ... + 2222611.

It is an arithmetic number, because the mean of its divisors is an integer number (305251561593).

Almost surely, 2^{1221002122201} is an apocalyptic number.

It is an amenable number.

1221002122201 is a deficient number, since it is larger than the sum of its proper divisors (4124171).

1221002122201 is an equidigital number, since it uses as much as digits as its factorization.

1221002122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124170.

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

Adding to 1221002122201 its reverse (1022212001221), we get a palindrome (2243214123422).

The spelling of 1221002122201 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty-two thousand, two hundred one".