1013221220 has 24 divisors (see below), whose sum is σ = 2321198208. Its totient is φ = 368444000.

The previous prime is 1013221211. The next prime is 1013221229. The reversal of 1013221220 is 221223101.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1013221211) and next prime (1013221229).

It is a junction number, because it is equal to n+sod(n) for n = 1013221195 and 1013221204.

It is not an unprimeable number, because it can be changed into a prime (1013221229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302556 + ... + 2302995.

It is an arithmetic number, because the mean of its divisors is an integer number (96716592).

Almost surely, 2^1013221220 is an apocalyptic number.

1013221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1013221220 is an abundant number, since it is smaller than the sum of its proper divisors (1307976988).

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

1013221220 is a wasteful number, since it uses less digits than its factorization.

1013221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4605571 (or 4605569 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1013221220 is about 31831.1360149147. The cubic root of 1013221220 is about 1004.3877924518.

Adding to 1013221220 its reverse (221223101), we get a palindrome (1234444321).

The spelling of 1013221220 in words is "one billion, thirteen million, two hundred twenty-one thousand, two hundred twenty".