1010011221 has 16 divisors (see below), whose sum is σ = 1520845120.
Its totient is φ = 662301360.
The previous prime is 1010011207. The next prime is 1010011229. The reversal of 1010011221 is 1221100101.
Adding to 1010011221 its reverse (1221100101), we get a palindrome (2231111322).
It can be divided in two parts, 10100 and 11221, that added together give a triangular number (21321 = T206).
It is a happy number.
1010011221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 1010011221 - 29 = 1010010709 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1010011229) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304975 + ... + 308268.
It is an arithmetic number, because the mean of its divisors is an integer number (95052820).
Almost surely, 21010011221 is an apocalyptic number.
It is an amenable number.
1010011221 is a deficient number, since it is larger than the sum of its proper divisors (510833899).
1010011221 is an equidigital number, since it uses as much as digits as its factorization.
1010011221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 613313 (or 613307 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 1010011221 is about 31780.6737027395.
The cubic root of 1010011221 is about 1003.3259991321.
The spelling of 1010011221 in words is "one billion, ten million, eleven thousand, two hundred twenty-one".