1221513107 has 2 divisors, whose sum is σ = 1221513108. Its totient is φ = 1221513106.

The previous prime is 1221513103. The next prime is 1221513133. The reversal of 1221513107 is 7013151221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221513107 - 2² = 1221513103 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221513103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610756553 + 610756554.

It is an arithmetic number, because the mean of its divisors is an integer number (610756554).

Almost surely, 2^1221513107 is an apocalyptic number.

1221513107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221513107 is an equidigital number, since it uses as much as digits as its factorization.

1221513107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 1221513107 is about 34950.1517450211. The cubic root of 1221513107 is about 1068.9712962313.

Adding to 1221513107 its reverse (7013151221), we get a palindrome (8234664328).

The spelling of 1221513107 in words is "one billion, two hundred twenty-one million, five hundred thirteen thousand, one hundred seven".