1221202221201 has 48 divisors (see below), whose sum is σ = 1820140328448. Its totient is φ = 788570640000.

The previous prime is 1221202221193. The next prime is 1221202221203. The reversal of 1221202221201 is 1021222021221.

It is a happy number.

1221202221201 is a `hidden beast` number, since 1 + 221 + 20 + 2 + 221 + 201 = 666.

It is not a de Polignac number, because 1221202221201 - 2³ = 1221202221193 is a prime.

It is a super-2 number, since 2×1221202221201² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221202221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123336351 + ... + 123346251.

It is an arithmetic number, because the mean of its divisors is an integer number (37919590176).

Almost surely, 2^{1221202221201} is an apocalyptic number.

It is an amenable number.

1221202221201 is a deficient number, since it is larger than the sum of its proper divisors (598938107247).

1221202221201 is a wasteful number, since it uses less digits than its factorization.

1221202221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942 (or 12939 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221202221201 its reverse (1021222021221), we get a palindrome (2242424242422).

The spelling of 1221202221201 in words is "one trillion, two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, two hundred one".