1221132232987 has 2 divisors, whose sum is σ = 1221132232988. Its totient is φ = 1221132232986.

The previous prime is 1221132232927. The next prime is 1221132233011. The reversal of 1221132232987 is 7892322311221.

It is a strong prime.

It is an emirp because it is prime and its reverse (7892322311221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221132232987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221132232927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610566116493 + 610566116494.

It is an arithmetic number, because the mean of its divisors is an integer number (610566116494).

Almost surely, 2^{1221132232987} is an apocalyptic number.

1221132232987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221132232987 is an equidigital number, since it uses as much as digits as its factorization.

1221132232987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The spelling of 1221132232987 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-two million, two hundred thirty-two thousand, nine hundred eighty-seven".