1221133031971 has 2 divisors, whose sum is σ = 1221133031972. Its totient is φ = 1221133031970.

The previous prime is 1221133031851. The next prime is 1221133032037. The reversal of 1221133031971 is 1791303311221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221133031971 - 2¹¹ = 1221133029923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221133031071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610566515985 + 610566515986.

It is an arithmetic number, because the mean of its divisors is an integer number (610566515986).

Almost surely, 2^{1221133031971} is an apocalyptic number.

1221133031971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221133031971 is an equidigital number, since it uses as much as digits as its factorization.

1221133031971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 34.

The spelling of 1221133031971 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, thirty-one thousand, nine hundred seventy-one".