2311120121220 has 72 divisors (see below), whose sum is σ = 7012379414040. Its totient is φ = 616124482560.

The previous prime is 2311120121173. The next prime is 2311120121237. The reversal of 2311120121220 is 221210211132.

2311120121220 is a `hidden beast` number, since 2 + 311 + 12 + 0 + 121 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 232038743616 + 2079081377604 = 481704^2 + 1441902^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2311120121193 and 2311120121202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1175605 + ... + 2450364.

Almost surely, 2^{2311120121220} is an apocalyptic number.

2311120121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2311120121220 is an abundant number, since it is smaller than the sum of its proper divisors (4701259292820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2311120121220 is a wasteful number, since it uses less digits than its factorization.

2311120121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3629525 (or 3629520 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 2311120121220 its reverse (221210211132), we get a palindrome (2532330332352).

The spelling of 2311120121220 in words is "two trillion, three hundred eleven billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty".