1220221209971 has 2 divisors, whose sum is σ = 1220221209972. Its totient is φ = 1220221209970.

The previous prime is 1220221209967. The next prime is 1220221210003. The reversal of 1220221209971 is 1799021220221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1799021220221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220221209971 - 2² = 1220221209967 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220221209671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110604985 + 610110604986.

It is an arithmetic number, because the mean of its divisors is an integer number (610110604986).

Almost surely, 2^{1220221209971} is an apocalyptic number.

1220221209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221209971 is an equidigital number, since it uses as much as digits as its factorization.

1220221209971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 1220221209971 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred nine thousand, nine hundred seventy-one".