1220121220188 has 48 divisors (see below), whose sum is σ = 3066781795616. Its totient is φ = 375319526400.

The previous prime is 1220121220163. The next prime is 1220121220189. The reversal of 1220121220188 is 8810221210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121220189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491713 + ... + 1637688.

Almost surely, 2^{1220121220188} is an apocalyptic number.

It is an amenable number.

1220121220188 is an abundant number, since it is smaller than the sum of its proper divisors (1846660575428).

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

1220121220188 is a wasteful number, since it uses less digits than its factorization.

1220121220188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133094 (or 2133092 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The spelling of 1220121220188 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eighty-eight".