1220121300 has 36 divisors (see below), whose sum is σ = 3530218496. Its totient is φ = 325365600.

The previous prime is 1220121283. The next prime is 1220121313. The reversal of 1220121300 is 31210221.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2033236 + ... + 2033835.

Almost surely, 2^1220121300 is an apocalyptic number.

1220121300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220121300 is an abundant number, since it is smaller than the sum of its proper divisors (2310097196).

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

1220121300 is a wasteful number, since it uses less digits than its factorization.

1220121300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067088 (or 4067081 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220121300 is about 34930.2347544359. The cubic root of 1220121300 is about 1068.5651422693.

Adding to 1220121300 its reverse (31210221), we get a palindrome (1251331521).

The spelling of 1220121300 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, three hundred".