1222021220 has 48 divisors (see below), whose sum is σ = 2961923328. Its totient is φ = 414825600.

The previous prime is 1222021219. The next prime is 1222021223. The reversal of 1222021220 is 221202221.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1222021195 and 1222021204.

It is not an unprimeable number, because it can be changed into a prime (1222021223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29072 + ... + 57351.

It is an arithmetic number, because the mean of its divisors is an integer number (61706736).

Almost surely, 2^1222021220 is an apocalyptic number.

1222021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222021220 is an abundant number, since it is smaller than the sum of its proper divisors (1739902108).

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

1222021220 is a wasteful number, since it uses less digits than its factorization.

1222021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86540 (or 86538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1222021220 is about 34957.4200993151. The cubic root of 1222021220 is about 1069.1194957373.

Adding to 1222021220 its reverse (221202221), we get a palindrome (1443223441).

The spelling of 1222021220 in words is "one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty".