1215221104 has 20 divisors (see below), whose sum is σ = 2435681160. Its totient is φ = 586658240.

The previous prime is 1215221101. The next prime is 1215221113. The reversal of 1215221104 is 4011225121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215221101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1309042 + ... + 1309969.

It is an arithmetic number, because the mean of its divisors is an integer number (121784058).

Almost surely, 2^1215221104 is an apocalyptic number.

It is an amenable number.

1215221104 is an abundant number, since it is smaller than the sum of its proper divisors (1220460056).

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

1215221104 is a wasteful number, since it uses less digits than its factorization.

1215221104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619048 (or 2619042 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 1215221104 is about 34860.0215719956. The cubic root of 1215221104 is about 1067.1327152677.

Adding to 1215221104 its reverse (4011225121), we get a palindrome (5226446225).

It can be divided in two parts, 121 and 5221104, that added together give a palindrome (5221225).

The spelling of 1215221104 in words is "one billion, two hundred fifteen million, two hundred twenty-one thousand, one hundred four".