10011221 has 8 divisors (see below), whose sum is σ = 11030688.
Its totient is φ = 9010000.
The previous prime is 10011203. The next prime is 10011227. The reversal of 10011221 is 12211001.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 10011221 - 214 = 9994837 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 10011199 and 10011208.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (10011227) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3395 + ... + 5616.
It is an arithmetic number, because the mean of its divisors is an integer number (1378836).
Almost surely, 210011221 is an apocalyptic number.
10011221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
10011221 is a deficient number, since it is larger than the sum of its proper divisors (1019467).
10011221 is a wasteful number, since it uses less digits than its factorization.
10011221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9123.
The product of its (nonzero) digits is 4, while the sum is 8.
The square root of 10011221 is about 3164.0513586224.
The cubic root of 10011221 is about 215.5240219201.
Adding to 10011221 its reverse (12211001), we get a palindrome (22222222).
It can be divided in two parts, 1001 and 1221, that multiplied together give a palindrome (1222221).
The spelling of 10011221 in words is "ten million, eleven thousand, two hundred twenty-one".