1212220104 has 64 divisors (see below), whose sum is σ = 3110063040. Its totient is φ = 393507840.

The previous prime is 1212220091. The next prime is 1212220111. The reversal of 1212220104 is 4010222121.

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, 1078887 + ... + 1080009.

It is an arithmetic number, because the mean of its divisors is an integer number (48594735).

Almost surely, 2^1212220104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212220104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555031520).

1212220104 is an abundant number, since it is smaller than the sum of its proper divisors (1897842936).

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

1212220104 is a wasteful number, since it uses less digits than its factorization.

1212220104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 2266 counting only the distinct ones).

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

The square root of 1212220104 is about 34816.9513886555. The cubic root of 1212220104 is about 1066.2535597343.

Adding to 1212220104 its reverse (4010222121), we get a palindrome (5222442225).

The spelling of 1212220104 in words is "one billion, two hundred twelve million, two hundred twenty thousand, one hundred four".