1220211311 has 6 divisors (see below), whose sum is σ = 1341224136. Its totient is φ = 1109282900.

The previous prime is 1220211277. The next prime is 1220211313. The reversal of 1220211311 is 1131120221.

It is not a de Polignac number, because 1220211311 - 2⁶ = 1220211247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5042075 + ... + 5042316.

It is an arithmetic number, because the mean of its divisors is an integer number (223537356).

Almost surely, 2^1220211311 is an apocalyptic number.

1220211311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220211311 is a deficient number, since it is larger than the sum of its proper divisors (121012825).

1220211311 is a wasteful number, since it uses less digits than its factorization.

1220211311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084413 (or 10084402 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1220211311 is about 34931.5231703400. The cubic root of 1220211311 is about 1068.5914184141.

Adding to 1220211311 its reverse (1131120221), we get a palindrome (2351331532).

The spelling of 1220211311 in words is "one billion, two hundred twenty million, two hundred eleven thousand, three hundred eleven".