1201122220 has 48 divisors (see below), whose sum is σ = 2553798240. Its totient is φ = 474499584.

The previous prime is 1201122211. The next prime is 1201122277. The reversal of 1201122220 is 222211021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201122220.

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, 560992 + ... + 563128.

It is an arithmetic number, because the mean of its divisors is an integer number (53204130).

Almost surely, 2^1201122220 is an apocalyptic number.

1201122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201122220 is an abundant number, since it is smaller than the sum of its proper divisors (1352676020).

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

1201122220 is a wasteful number, since it uses less digits than its factorization.

1201122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1201122220 is about 34657.2102166346. The cubic root of 1201122220 is about 1062.9897261675.

Adding to 1201122220 its reverse (222211021), we get a palindrome (1423333241).

The spelling of 1201122220 in words is "one billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty".