1220121320 has 32 divisors (see below), whose sum is σ = 2994844320. Its totient is φ = 443680320.

The previous prime is 1220121313. The next prime is 1220121373. The reversal of 1220121320 is 231210221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1220121295 and 1220121304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1386062 + ... + 1386941.

It is an arithmetic number, because the mean of its divisors is an integer number (93588885).

Almost surely, 2^1220121320 is an apocalyptic number.

1220121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220121320 is an abundant number, since it is smaller than the sum of its proper divisors (1774723000).

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

1220121320 is a wasteful number, since it uses less digits than its factorization.

1220121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773025 (or 2773021 counting only the distinct ones).

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

The square root of 1220121320 is about 34930.2350407208. The cubic root of 1220121320 is about 1068.5651481079.

Adding to 1220121320 its reverse (231210221), we get a palindrome (1451331541).

The spelling of 1220121320 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, three hundred twenty".