1220403211 has 2 divisors, whose sum is σ = 1220403212. Its totient is φ = 1220403210.

The previous prime is 1220403209. The next prime is 1220403251. The reversal of 1220403211 is 1123040221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220403211 - 2¹ = 1220403209 is a prime.

It is a super-2 number, since 2×1220403211² = 2978767994838221042, which contains 22 as substring.

Together with 1220403209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1220403251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610201605 + 610201606.

It is an arithmetic number, because the mean of its divisors is an integer number (610201606).

Almost surely, 2^1220403211 is an apocalyptic number.

1220403211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220403211 is an equidigital number, since it uses as much as digits as its factorization.

1220403211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220403211 is about 34934.2698649907. The cubic root of 1220403211 is about 1068.6474338333.

Adding to 1220403211 its reverse (1123040221), we get a palindrome (2343443432).

The spelling of 1220403211 in words is "one billion, two hundred twenty million, four hundred three thousand, two hundred eleven".