1221221202201 has 48 divisors (see below), whose sum is σ = 2368429015680. Its totient is φ = 585600572160.

The previous prime is 1221221202163. The next prime is 1221221202259. The reversal of 1221221202201 is 1022021221221.

It is a happy number.

1221221202201 is a `hidden beast` number, since 1 + 221 + 221 + 2 + 0 + 220 + 1 = 666.

It is not a de Polignac number, because 1221221202201 - 2¹⁰ = 1221221201177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221221202001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67768836 + ... + 67786853.

It is an arithmetic number, because the mean of its divisors is an integer number (49342271160).

Almost surely, 2^{1221221202201} is an apocalyptic number.

1221221202201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221221202201 is a deficient number, since it is larger than the sum of its proper divisors (1147207813479).

1221221202201 is a wasteful number, since it uses less digits than its factorization.

1221221202201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135555726 (or 135555723 counting only the distinct ones).

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

Adding to 1221221202201 its reverse (1022021221221), we get a palindrome (2243242423422).

The spelling of 1221221202201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred two thousand, two hundred one".