1221210200201 has 4 divisors (see below), whose sum is σ = 1233301390404. Its totient is φ = 1209119010000.

The previous prime is 1221210200107. The next prime is 1221210200209. The reversal of 1221210200201 is 1020020121221.

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 1165646281801 + 55563918400 = 1079651^2 + 235720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221210200201 - 2¹⁰ = 1221210199177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221210200209) 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, 6045594950 + ... + 6045595151.

It is an arithmetic number, because the mean of its divisors is an integer number (308325347601).

Almost surely, 2^{1221210200201} is an apocalyptic number.

It is an amenable number.

1221210200201 is a deficient number, since it is larger than the sum of its proper divisors (12091190203).

1221210200201 is a wasteful number, since it uses less digits than its factorization.

1221210200201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12091190202.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221210200201 its reverse (1020020121221), we get a palindrome (2241230321422).

The spelling of 1221210200201 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred thousand, two hundred one".