218142134703421 has 16 divisors (see below), whose sum is σ = 219336627653568. Its totient is φ = 216948316032000.

The previous prime is 218142134703347. The next prime is 218142134703461. The reversal of 218142134703421 is 124307431241812.

218142134703421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 218142134703421 - 2³⁹ = 217592378889533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218142134703461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17841012510 + ... + 17841024736.

It is an arithmetic number, because the mean of its divisors is an integer number (13708539228348).

Almost surely, 2^{218142134703421} is an apocalyptic number.

It is an amenable number.

218142134703421 is a deficient number, since it is larger than the sum of its proper divisors (1194492950147).

218142134703421 is a wasteful number, since it uses less digits than its factorization.

218142134703421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31932.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 218142134703421 in words is "two hundred eighteen trillion, one hundred forty-two billion, one hundred thirty-four million, seven hundred three thousand, four hundred twenty-one".