1221221104 has 10 divisors (see below), whose sum is σ = 2366115920. Its totient is φ = 610610544.

The previous prime is 1221221093. The next prime is 1221221119. The reversal of 1221221104 is 4011221221.

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 76326319 = 1221221104 / (1 + 2 + 2 + 1 + 2 + 2 + 1 + 1 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38163144 + ... + 38163175.

It is an arithmetic number, because the mean of its divisors is an integer number (236611592).

Almost surely, 2^1221221104 is an apocalyptic number.

It is an amenable number.

1221221104 is a deficient number, since it is larger than the sum of its proper divisors (1144894816).

1221221104 is an equidigital number, since it uses as much as digits as its factorization.

1221221104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76326327 (or 76326321 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221221104 is about 34945.9740742764. The cubic root of 1221221104 is about 1068.8861101618.

Adding to 1221221104 its reverse (4011221221), we get a palindrome (5232442325).

The spelling of 1221221104 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred four".