1021220 has 12 divisors (see below), whose sum is σ = 2144604. Its totient is φ = 408480.

The previous prime is 1021217. The next prime is 1021243. The reversal of 1021220 is 221201.

1021220 = 26² + 27² + ... + 145².

1021220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 879844 = 376^2 + 938^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1021198 and 1021207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25511 + ... + 25550.

It is an arithmetic number, because the mean of its divisors is an integer number (178717).

2^1021220 is an apocalyptic number.

1021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021220 is an abundant number, since it is smaller than the sum of its proper divisors (1123384).

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

1021220 is a wasteful number, since it uses less digits than its factorization.

1021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51070 (or 51068 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1021220 is about 1010.5543033405. The cubic root of 1021220 is about 100.7023882895.

Adding to 1021220 its reverse (221201), we get a palindrome (1242421).

The spelling of 1021220 in words is "one million, twenty-one thousand, two hundred twenty".