1221010108 has 24 divisors (see below), whose sum is σ = 2360830752. Its totient is φ = 549609984.

The previous prime is 1221010103. The next prime is 1221010111. The reversal of 1221010108 is 8010101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010091 and 1221010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388785 + ... + 391912.

It is an arithmetic number, because the mean of its divisors is an integer number (98367948).

Almost surely, 2^1221010108 is an apocalyptic number.

It is an amenable number.

1221010108 is a deficient number, since it is larger than the sum of its proper divisors (1139820644).

1221010108 is a wasteful number, since it uses less digits than its factorization.

1221010108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780741 (or 780739 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 1221010108 is about 34942.9550553470. The cubic root of 1221010108 is about 1068.8245478226.

Adding to 1221010108 its reverse (8010101221), we get a palindrome (9231111329).

The spelling of 1221010108 in words is "one billion, two hundred twenty-one million, ten thousand, one hundred eight".