1201220122221 has 12 divisors (see below), whose sum is σ = 1982966551072. Its totient is φ = 686411498376.

The previous prime is 1201220122181. The next prime is 1201220122259. The reversal of 1201220122221 is 1222210221021.

It is a happy number.

1201220122221 is a `hidden beast` number, since 1 + 201 + 220 + 1 + 22 + 221 = 666.

It is not a de Polignac number, because 1201220122221 - 2¹⁴ = 1201220105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201220122194 and 1201220122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220122261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9533492971 + ... + 9533493096.

Almost surely, 2^{1201220122221} is an apocalyptic number.

It is an amenable number.

1201220122221 is a deficient number, since it is larger than the sum of its proper divisors (781746428851).

1201220122221 is a wasteful number, since it uses less digits than its factorization.

1201220122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19066986080 (or 19066986077 counting only the distinct ones).

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

Adding to 1201220122221 its reverse (1222210221021), we get a palindrome (2423430343242).

The spelling of 1201220122221 in words is "one trillion, two hundred one billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-one".