1216022071 has 4 divisors (see below), whose sum is σ = 1326569544. Its totient is φ = 1105474600.

The previous prime is 1216022051. The next prime is 1216022077. The reversal of 1216022071 is 1702206121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1216022071 - 2²¹ = 1213924919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216022077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55273720 + ... + 55273741.

It is an arithmetic number, because the mean of its divisors is an integer number (331642386).

Almost surely, 2^1216022071 is an apocalyptic number.

1216022071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1216022071 is a deficient number, since it is larger than the sum of its proper divisors (110547473).

1216022071 is a wasteful number, since it uses less digits than its factorization.

1216022071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110547472.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 1216022071 is about 34871.5080115558. The cubic root of 1216022071 is about 1067.3671171573.

Adding to 1216022071 its reverse (1702206121), we get a palindrome (2918228192).

The spelling of 1216022071 in words is "one billion, two hundred sixteen million, twenty-two thousand, seventy-one".