1221071017 has 8 divisors (see below), whose sum is σ = 1248530976. Its totient is φ = 1193914752.

The previous prime is 1221070931. The next prime is 1221071041. The reversal of 1221071017 is 7101701221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221071017 - 2²⁷ = 1086853289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221075017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67783 + ... + 83884.

It is an arithmetic number, because the mean of its divisors is an integer number (156066372).

Almost surely, 2^1221071017 is an apocalyptic number.

It is an amenable number.

1221071017 is a deficient number, since it is larger than the sum of its proper divisors (27459959).

1221071017 is an equidigital number, since it uses as much as digits as its factorization.

1221071017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151847.

The product of its (nonzero) digits is 196, while the sum is 22.

The square root of 1221071017 is about 34943.8265935487. The cubic root of 1221071017 is about 1068.8423199801.

Adding to 1221071017 its reverse (7101701221), we get a palindrome (8322772238).

The spelling of 1221071017 in words is "one billion, two hundred twenty-one million, seventy-one thousand, seventeen".