1220042071 has 2 divisors, whose sum is σ = 1220042072. Its totient is φ = 1220042070.

The previous prime is 1220042069. The next prime is 1220042113. The reversal of 1220042071 is 1702400221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220042071 - 2¹ = 1220042069 is a prime.

Together with 1220042069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220042051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610021035 + 610021036.

It is an arithmetic number, because the mean of its divisors is an integer number (610021036).

Almost surely, 2^1220042071 is an apocalyptic number.

1220042071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220042071 is an equidigital number, since it uses as much as digits as its factorization.

1220042071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 1220042071 is about 34929.1006325671. The cubic root of 1220042071 is about 1068.5420125526.

Adding to 1220042071 its reverse (1702400221), we get a palindrome (2922442292).

The spelling of 1220042071 in words is "one billion, two hundred twenty million, forty-two thousand, seventy-one".