1221012 has 36 divisors (see below), whose sum is σ = 3325140.
Its totient is φ = 375552.
The previous prime is 1220993. The next prime is 1221019. The reversal of 1221012 is 2101221.
Adding to 1221012 its reverse (2101221), we get a palindrome (3322233).
It can be written as a sum of positive squares in 2 ways, for example, as 367236 + 853776 = 606^2 + 924^2
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 1220985 and 1221003.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1221019) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 837 + ... + 1772.
It is an arithmetic number, because the mean of its divisors is an integer number (92365).
21221012 is an apocalyptic number.
1221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
1221012 is an abundant number, since it is smaller than the sum of its proper divisors (2104128).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221012 is a wasteful number, since it uses less digits than its factorization.
1221012 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2632 (or 2627 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 1221012 is about 1104.9941176314.
The cubic root of 1221012 is about 106.8825099883.
The spelling of 1221012 in words is "one million, two hundred twenty-one thousand, twelve".