1221072067 has 4 divisors (see below), whose sum is σ = 1222257456. Its totient is φ = 1219886680.

The previous prime is 1221072043. The next prime is 1221072131. The reversal of 1221072067 is 7602701221.

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 1221072067 - 2¹⁵ = 1221039299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221073067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591148 + ... + 593209.

It is an arithmetic number, because the mean of its divisors is an integer number (305564364).

Almost surely, 2^1221072067 is an apocalyptic number.

1221072067 is a deficient number, since it is larger than the sum of its proper divisors (1185389).

1221072067 is a wasteful number, since it uses less digits than its factorization.

1221072067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185388.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 1221072067 is about 34943.8416176585. The cubic root of 1221072067 is about 1068.8426263461.

Adding to 1221072067 its reverse (7602701221), we get a palindrome (8823773288).

The spelling of 1221072067 in words is "one billion, two hundred twenty-one million, seventy-two thousand, sixty-seven".