1321220 has 24 divisors (see below), whose sum is σ = 2865408. Its totient is φ = 511200.

The previous prime is 1321219. The next prime is 1321247. The reversal of 1321220 is 221231.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446 + ... + 1685.

It is an arithmetic number, because the mean of its divisors is an integer number (119392).

2^1321220 is an apocalyptic number.

1321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321220 is an abundant number, since it is smaller than the sum of its proper divisors (1544188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321220 is a wasteful number, since it uses less digits than its factorization.

1321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171 (or 2169 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1321220 is about 1149.4433435363. The cubic root of 1321220 is about 109.7299159150.

Adding to 1321220 its sum of digits (11), we get a palindrome (1321231).

Adding to 1321220 its reverse (221231), we get a palindrome (1542451).

The spelling of 1321220 in words is "one million, three hundred twenty-one thousand, two hundred twenty".