1221571327 has 2 divisors, whose sum is σ = 1221571328. Its totient is φ = 1221571326.

The previous prime is 1221571301. The next prime is 1221571333. The reversal of 1221571327 is 7231751221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221571327 - 2¹⁵ = 1221538559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221571357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610785663 + 610785664.

It is an arithmetic number, because the mean of its divisors is an integer number (610785664).

Almost surely, 2^1221571327 is an apocalyptic number.

1221571327 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221571327 is an equidigital number, since it uses as much as digits as its factorization.

1221571327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5880, while the sum is 31.

The square root of 1221571327 is about 34950.9846356294. The cubic root of 1221571327 is about 1068.9882791355.

The spelling of 1221571327 in words is "one billion, two hundred twenty-one million, five hundred seventy-one thousand, three hundred twenty-seven".