123555162021 has 16 divisors (see below), whose sum is σ = 165075398784. Its totient is φ = 82202589504.

The previous prime is 123555161981. The next prime is 123555162037. The reversal of 123555162021 is 120261555321.

It is not a de Polignac number, because 123555162021 - 2¹⁸ = 123554899877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123555162221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11395815 + ... + 11406651.

It is an arithmetic number, because the mean of its divisors is an integer number (10317212424).

Almost surely, 2^123555162021 is an apocalyptic number.

It is an amenable number.

123555162021 is a deficient number, since it is larger than the sum of its proper divisors (41520236763).

123555162021 is a wasteful number, since it uses less digits than its factorization.

123555162021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18220.

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 123555162021 in words is "one hundred twenty-three billion, five hundred fifty-five million, one hundred sixty-two thousand, twenty-one".