1220203011 has 4 divisors (see below), whose sum is σ = 1626937352. Its totient is φ = 813468672.

The previous prime is 1220202979. The next prime is 1220203027. The reversal of 1220203011 is 1103020221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1103020221 = 3 ⋅367673407.

It is not a de Polignac number, because 1220203011 - 2⁵ = 1220202979 is a prime.

It is a super-2 number, since 2×1220203011² = 2977790776106932242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220203211) 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, 203367166 + ... + 203367171.

It is an arithmetic number, because the mean of its divisors is an integer number (406734338).

Almost surely, 2^1220203011 is an apocalyptic number.

1220203011 is a deficient number, since it is larger than the sum of its proper divisors (406734341).

1220203011 is an equidigital number, since it uses as much as digits as its factorization.

1220203011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406734340.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1220203011 is about 34931.4043662719. The cubic root of 1220203011 is about 1068.5889955199.

Adding to 1220203011 its reverse (1103020221), we get a palindrome (2323223232).

The spelling of 1220203011 in words is "one billion, two hundred twenty million, two hundred three thousand, eleven".