1220212771 has 2 divisors, whose sum is σ = 1220212772. Its totient is φ = 1220212770.

The previous prime is 1220212753. The next prime is 1220212801. The reversal of 1220212771 is 1772120221.

It is a weak prime.

It is an emirp because it is prime and its reverse (1772120221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220212771 is a prime.

It is a super-2 number, since 2×1220212771² = 2977838413022996882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1220212711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610106385 + 610106386.

It is an arithmetic number, because the mean of its divisors is an integer number (610106386).

Almost surely, 2^1220212771 is an apocalyptic number.

1220212771 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220212771 is an equidigital number, since it uses as much as digits as its factorization.

1220212771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 1220212771 is about 34931.5440683632. The cubic root of 1220212771 is about 1068.5918446089.

Adding to 1220212771 its reverse (1772120221), we get a palindrome (2992332992).

The spelling of 1220212771 in words is "one billion, two hundred twenty million, two hundred twelve thousand, seven hundred seventy-one".