1220221020 has 48 divisors (see below), whose sum is σ = 3418426368. Its totient is φ = 325220160.

The previous prime is 1220220973. The next prime is 1220221043. The reversal of 1220221020 is 201220221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1220220987 and 1220221005.

It is a congruent number.

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, 142665 + ... + 150975.

It is an arithmetic number, because the mean of its divisors is an integer number (71217216).

Almost surely, 2^1220221020 is an apocalyptic number.

1220221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221020 is an abundant number, since it is smaller than the sum of its proper divisors (2198205348).

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

1220221020 is a wasteful number, since it uses less digits than its factorization.

1220221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770 (or 10768 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1220221020 is about 34931.6621419594. The cubic root of 1220221020 is about 1068.5942526026.

Adding to 1220221020 its reverse (201220221), we get a palindrome (1421441241).

The spelling of 1220221020 in words is "one billion, two hundred twenty million, two hundred twenty-one thousand, twenty".