1220342511311 has 32 divisors (see below), whose sum is σ = 1611312611328. Its totient is φ = 895996268640.

The previous prime is 1220342511287. The next prime is 1220342511317. The reversal of 1220342511311 is 1131152430221.

It is not a de Polignac number, because 1220342511311 - 2¹⁸ = 1220342249167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220342511317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5023655 + ... + 5260968.

It is an arithmetic number, because the mean of its divisors is an integer number (50353519104).

Almost surely, 2^{1220342511311} is an apocalyptic number.

1220342511311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220342511311 is a deficient number, since it is larger than the sum of its proper divisors (390970100017).

1220342511311 is a wasteful number, since it uses less digits than its factorization.

1220342511311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284731.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 1220342511311 its reverse (1131152430221), we get a palindrome (2351494941532).

The spelling of 1220342511311 in words is "one trillion, two hundred twenty billion, three hundred forty-two million, five hundred eleven thousand, three hundred eleven".