1221231107 has 2 divisors, whose sum is σ = 1221231108. Its totient is φ = 1221231106.

The previous prime is 1221231101. The next prime is 1221231113. The reversal of 1221231107 is 7011321221.

It is a balanced prime because it is at equal distance from previous prime (1221231101) and next prime (1221231113).

It is a cyclic number.

It is not a de Polignac number, because 1221231107 - 2¹⁰ = 1221230083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221231101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610615553 + 610615554.

It is an arithmetic number, because the mean of its divisors is an integer number (610615554).

Almost surely, 2^1221231107 is an apocalyptic number.

1221231107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221231107 is an equidigital number, since it uses as much as digits as its factorization.

1221231107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 1221231107 is about 34946.1171949045. The cubic root of 1221231107 is about 1068.8890285628.

Adding to 1221231107 its reverse (7011321221), we get a palindrome (8232552328).

The spelling of 1221231107 in words is "one billion, two hundred twenty-one million, two hundred thirty-one thousand, one hundred seven".