1221502103 has 2 divisors, whose sum is σ = 1221502104. Its totient is φ = 1221502102.

The previous prime is 1221502099. The next prime is 1221502111. The reversal of 1221502103 is 3012051221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221502103 - 2² = 1221502099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221502133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610751051 + 610751052.

It is an arithmetic number, because the mean of its divisors is an integer number (610751052).

Almost surely, 2^1221502103 is an apocalyptic number.

1221502103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221502103 is an equidigital number, since it uses as much as digits as its factorization.

1221502103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1221502103 is about 34949.9943204573. The cubic root of 1221502103 is about 1068.9680862793.

Adding to 1221502103 its reverse (3012051221), we get a palindrome (4233553324).

The spelling of 1221502103 in words is "one billion, two hundred twenty-one million, five hundred two thousand, one hundred three".