1220221212 has 48 divisors (see below), whose sum is σ = 3268564992. Its totient is φ = 347065920.

The previous prime is 1220221201. The next prime is 1220221217. The reversal of 1220221212 is 2121220221.

It is a junction number, because it is equal to n+sod(n) for n = 1220221191 and 1220221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220221217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13839 + ... + 51302.

It is an arithmetic number, because the mean of its divisors is an integer number (68095104).

Almost surely, 2^1220221212 is an apocalyptic number.

1220221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220221212 is an abundant number, since it is smaller than the sum of its proper divisors (2048343780).

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

1220221212 is a wasteful number, since it uses less digits than its factorization.

1220221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65378 (or 65376 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1220221212 is about 34931.6648901824. The cubic root of 1220221212 is about 1068.5943086499.

Adding to 1220221212 its reverse (2121220221), we get a palindrome (3341441433).

Subtracting 1220221212 from its reverse (2121220221), we obtain a palindrome (900999009).

It can be divided in two parts, 1220221 and 212, that multiplied together give a palindrome (258686852).

The spelling of 1220221212 in words is "one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twelve".