1001221201 has 4 divisors (see below), whose sum is σ = 1035746100. Its totient is φ = 966696304.

The previous prime is 1001221187. The next prime is 1001221223. The reversal of 1001221201 is 1021221001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1021221001 = 103 ⋅9914767.

It can be written as a sum of positive squares in 2 ways, for example, as 684345600 + 316875601 = 26160^2 + 17801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001221201 - 2¹⁹ = 1000696913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001221231) 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 3 ways as a sum of consecutive naturals, for example, 17262406 + ... + 17262463.

It is an arithmetic number, because the mean of its divisors is an integer number (258936525).

Almost surely, 2^1001221201 is an apocalyptic number.

It is an amenable number.

1001221201 is a deficient number, since it is larger than the sum of its proper divisors (34524899).

1001221201 is an equidigital number, since it uses as much as digits as its factorization.

1001221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34524898.

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

The square root of 1001221201 is about 31642.0795934780. The cubic root of 1001221201 is about 1000.4069014088.

Adding to 1001221201 its reverse (1021221001), we get a palindrome (2022442202).

It can be divided in two parts, 10012 and 21201, that added together give a palindrome (31213).

The spelling of 1001221201 in words is "one billion, one million, two hundred twenty-one thousand, two hundred one".