1220400220122 has 24 divisors (see below), whose sum is σ = 2644231725876. Its totient is φ = 406795265856.

The previous prime is 1220400220079. The next prime is 1220400220133. The reversal of 1220400220122 is 2210220040221.

1220400220122 is a `hidden beast` number, since 1 + 2 + 20 + 400 + 220 + 1 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1216783280241 + 3616939881 = 1103079^2 + 60141^2 .

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 = 1220400220095 and 1220400220104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1378278 + ... + 2083374.

Almost surely, 2^{1220400220122} is an apocalyptic number.

1220400220122 is an abundant number, since it is smaller than the sum of its proper divisors (1423831505754).

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

1220400220122 is a wasteful number, since it uses less digits than its factorization.

1220400220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801262 (or 801259 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 1220400220122 its reverse (2210220040221), we get a palindrome (3430620260343).

The spelling of 1220400220122 in words is "one trillion, two hundred twenty billion, four hundred million, two hundred twenty thousand, one hundred twenty-two".