10121220 has 48 divisors (see below), whose sum is σ = 31489920.
Its totient is φ = 2698848.
The previous prime is 10121183. The next prime is 10121233. The reversal of 10121220 is 2212101.
Adding to 10121220 its reverse (2212101), we get a palindrome (12333321).
It can be divided in two parts, 101 and 21220, that added together give a triangular number (21321 = T206).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8832 + ... + 9911.
It is an arithmetic number, because the mean of its divisors is an integer number (656040).
Almost surely, 210121220 is an apocalyptic number.
10121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
10121220 is an abundant number, since it is smaller than the sum of its proper divisors (21368700).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
10121220 is a wasteful number, since it uses less digits than its factorization.
10121220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 18761 (or 18753 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 10121220 is about 3181.3864901957.
The cubic root of 10121220 is about 216.3105102031.
The spelling of 10121220 in words is "ten million, one hundred twenty-one thousand, two hundred twenty".