1220020211 has 4 divisors (see below), whose sum is σ = 1273064592. Its totient is φ = 1166975832.

The previous prime is 1220020199. The next prime is 1220020247. The reversal of 1220020211 is 1120200221.

It is a happy number.

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 1220020211 - 2¹⁰ = 1220019187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220020192 and 1220020201.

It is not an unprimeable number, because it can be changed into a prime (1220025211) 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, 26522156 + ... + 26522201.

It is an arithmetic number, because the mean of its divisors is an integer number (318266148).

Almost surely, 2^1220020211 is an apocalyptic number.

1220020211 is a deficient number, since it is larger than the sum of its proper divisors (53044381).

1220020211 is an equidigital number, since it uses as much as digits as its factorization.

1220020211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53044380.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1220020211 is about 34928.7877115711. The cubic root of 1220020211 is about 1068.5356306776.

Adding to 1220020211 its reverse (1120200221), we get a palindrome (2340220432).

The spelling of 1220020211 in words is "one billion, two hundred twenty million, twenty thousand, two hundred eleven".