1201001221 has 12 divisors (see below), whose sum is σ = 1399956480. Its totient is φ = 1027312440.

The previous prime is 1201001209. The next prime is 1201001231. The reversal of 1201001221 is 1221001021.

It is not a de Polignac number, because 1201001221 - 2¹⁷ = 1200870149 is a prime.

It is a Duffinian number.

1201001221 is a modest number, since divided by 1221 gives 1201 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1201001198 and 1201001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201001231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 901 + ... + 49018.

It is an arithmetic number, because the mean of its divisors is an integer number (116663040).

Almost surely, 2^1201001221 is an apocalyptic number.

It is an amenable number.

1201001221 is a deficient number, since it is larger than the sum of its proper divisors (198955259).

1201001221 is an equidigital number, since it uses as much as digits as its factorization.

1201001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50424 (or 50417 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1201001221 is about 34655.4645186008. The cubic root of 1201001221 is about 1062.9540303793.

Adding to 1201001221 its reverse (1221001021), we get a palindrome (2422002242).

The spelling of 1201001221 in words is "one billion, two hundred one million, one thousand, two hundred twenty-one".