1010001221 has 4 divisors (see below), whose sum is σ = 1063159200. Its totient is φ = 956843244.

The previous prime is 1010001203. The next prime is 1010001227. The reversal of 1010001221 is 1221000101.

1010001221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1010001221 - 2¹⁴ = 1009984837 is a prime.

It is a Duffinian number.

1010001221 is a modest number, since divided by 1221 gives 1010 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1010001199 and 1010001208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010001227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26578961 + ... + 26578998.

It is an arithmetic number, because the mean of its divisors is an integer number (265789800).

Almost surely, 2^1010001221 is an apocalyptic number.

It is an amenable number.

1010001221 is a deficient number, since it is larger than the sum of its proper divisors (53157979).

1010001221 is an equidigital number, since it uses as much as digits as its factorization.

1010001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53157978.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1010001221 is about 31780.5163740302. The cubic root of 1010001221 is about 1003.3226878510.

Adding to 1010001221 its reverse (1221000101), we get a palindrome (2231001322).

The spelling of 1010001221 in words is "one billion, ten million, one thousand, two hundred twenty-one".