1220420211 has 4 divisors (see below), whose sum is σ = 1627226952. Its totient is φ = 813613472.

The previous prime is 1220420177. The next prime is 1220420213. The reversal of 1220420211 is 1120240221.

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 1220420211 - 2⁷ = 1220420083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220420213) 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, 203403366 + ... + 203403371.

It is an arithmetic number, because the mean of its divisors is an integer number (406806738).

Almost surely, 2^1220420211 is an apocalyptic number.

1220420211 is a deficient number, since it is larger than the sum of its proper divisors (406806741).

1220420211 is an equidigital number, since it uses as much as digits as its factorization.

1220420211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406806740.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1220420211 is about 34934.5131782311. The cubic root of 1220420211 is about 1068.6523958333.

Adding to 1220420211 its reverse (1120240221), we get a palindrome (2340660432).

The spelling of 1220420211 in words is "one billion, two hundred twenty million, four hundred twenty thousand, two hundred eleven".