1221513103 has 2 divisors, whose sum is σ = 1221513104. Its totient is φ = 1221513102.

The previous prime is 1221513043. The next prime is 1221513107. The reversal of 1221513103 is 3013151221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221513103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221513107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610756551 + 610756552.

It is an arithmetic number, because the mean of its divisors is an integer number (610756552).

Almost surely, 2^1221513103 is an apocalyptic number.

1221513103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221513103 is an equidigital number, since it uses as much as digits as its factorization.

1221513103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1221513103 is about 34950.1516877967. The cubic root of 1221513103 is about 1068.9712950645.

Adding to 1221513103 its reverse (3013151221), we get a palindrome (4234664324).

The spelling of 1221513103 in words is "one billion, two hundred twenty-one million, five hundred thirteen thousand, one hundred three".