1220120311 has 8 divisors (see below), whose sum is σ = 1292211360. Its totient is φ = 1148064768.

The previous prime is 1220120309. The next prime is 1220120389. The reversal of 1220120311 is 1130210221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220120311 - 2¹ = 1220120309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220120291 and 1220120300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220120911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100455 + ... + 111943.

It is an arithmetic number, because the mean of its divisors is an integer number (161526420).

Almost surely, 2^1220120311 is an apocalyptic number.

1220120311 is a deficient number, since it is larger than the sum of its proper divisors (72091049).

1220120311 is a wasteful number, since it uses less digits than its factorization.

1220120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17753.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1220120311 is about 34930.2205976430. The cubic root of 1220120311 is about 1068.5648535518.

Adding to 1220120311 its reverse (1130210221), we get a palindrome (2350330532).

The spelling of 1220120311 in words is "one billion, two hundred twenty million, one hundred twenty thousand, three hundred eleven".