1221207706 has 8 divisors (see below), whose sum is σ = 1832231520. Its totient is φ = 610463868.

The previous prime is 1221207703. The next prime is 1221207709. The reversal of 1221207706 is 6077021221.

It is an interprime number because it is at equal distance from previous prime (1221207703) and next prime (1221207709).

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

It is a super-2 number, since 2×1221207706² = 2982696522387564872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221207703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58726 + ... + 76753.

It is an arithmetic number, because the mean of its divisors is an integer number (229028940).

Almost surely, 2^1221207706 is an apocalyptic number.

1221207706 is a deficient number, since it is larger than the sum of its proper divisors (611023814).

1221207706 is a wasteful number, since it uses less digits than its factorization.

1221207706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139988.

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

The square root of 1221207706 is about 34945.7823778493. The cubic root of 1221207706 is about 1068.8822012359.

Adding to 1221207706 its reverse (6077021221), we get a palindrome (7298228927).

The spelling of 1221207706 in words is "one billion, two hundred twenty-one million, two hundred seven thousand, seven hundred six".