1212412220 has 48 divisors (see below), whose sum is σ = 2571041088. Its totient is φ = 480230400.

The previous prime is 1212412213. The next prime is 1212412237. The reversal of 1212412220 is 222142121.

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, 1790522 + ... + 1791198.

It is an arithmetic number, because the mean of its divisors is an integer number (53563356).

Almost surely, 2^1212412220 is an apocalyptic number.

1212412220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212412220 is an abundant number, since it is smaller than the sum of its proper divisors (1358628868).

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

1212412220 is a wasteful number, since it uses less digits than its factorization.

1212412220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1212412220 is about 34819.7102228034. The cubic root of 1212412220 is about 1066.3098843648.

Adding to 1212412220 its reverse (222142121), we get a palindrome (1434554341).

The spelling of 1212412220 in words is "one billion, two hundred twelve million, four hundred twelve thousand, two hundred twenty".