20121089055 has 16 divisors (see below), whose sum is σ = 32478645600. Its totient is φ = 10636279808.

The previous prime is 20121089047. The next prime is 20121089081. The reversal of 20121089055 is 55098012102.

It is a cyclic number.

It is not a de Polignac number, because 20121089055 - 2³ = 20121089047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5933730 + ... + 5937119.

It is an arithmetic number, because the mean of its divisors is an integer number (2029915350).

Almost surely, 2^20121089055 is an apocalyptic number.

20121089055 is a deficient number, since it is larger than the sum of its proper divisors (12357556545).

20121089055 is a wasteful number, since it uses less digits than its factorization.

20121089055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11870970.

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 20121089055 in words is "twenty billion, one hundred twenty-one million, eighty-nine thousand, fifty-five".