21728354123058 has 16 divisors (see below), whose sum is σ = 47407318086816. Its totient is φ = 6584349734240.

The previous prime is 21728354123057. The next prime is 21728354123089. The reversal of 21728354123058 is 85032145382712.

It is a super-3 number, since 3×21728354123058³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21728354123058.

It is not an unprimeable number, because it can be changed into a prime (21728354123057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164608743291 + ... + 164608743422.

It is an arithmetic number, because the mean of its divisors is an integer number (2962957380426).

Almost surely, 2^{21728354123058} is an apocalyptic number.

21728354123058 is an abundant number, since it is smaller than the sum of its proper divisors (25678963963758).

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

21728354123058 is a wasteful number, since it uses less digits than its factorization.

21728354123058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329217486729.

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 21728354123058 in words is "twenty-one trillion, seven hundred twenty-eight billion, three hundred fifty-four million, one hundred twenty-three thousand, fifty-eight".