1220661211 has 8 divisors (see below), whose sum is σ = 1521863424. Its totient is φ = 951164520.

The previous prime is 1220661187. The next prime is 1220661227. The reversal of 1220661211 is 1121660221.

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 1220661211 - 2⁹ = 1220660699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220662211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7926295 + ... + 7926448.

It is an arithmetic number, because the mean of its divisors is an integer number (190232928).

Almost surely, 2^1220661211 is an apocalyptic number.

1220661211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220661211 is a deficient number, since it is larger than the sum of its proper divisors (301202213).

1220661211 is a wasteful number, since it uses less digits than its factorization.

1220661211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15852761.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1220661211 is about 34937.9623189447. The cubic root of 1220661211 is about 1068.7227345232.

The spelling of 1220661211 in words is "one billion, two hundred twenty million, six hundred sixty-one thousand, two hundred eleven".