21018127139793 has 24 divisors (see below), whose sum is σ = 34697682397248. Its totient is φ = 12009980516832.

The previous prime is 21018127139767. The next prime is 21018127139837. The reversal of 21018127139793 is 39793172181012.

21018127139793 is a `hidden beast` number, since 2 + 1 + 0 + 181 + 2 + 71 + 397 + 9 + 3 = 666.

It is not a de Polignac number, because 21018127139793 - 2²⁵ = 21018093585361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21018127139743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3223330 + ... + 7240587.

It is an arithmetic number, because the mean of its divisors is an integer number (1445736766552).

Almost surely, 2^{21018127139793} is an apocalyptic number.

It is an amenable number.

21018127139793 is a deficient number, since it is larger than the sum of its proper divisors (13679555257455).

21018127139793 is a wasteful number, since it uses less digits than its factorization.

21018127139793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10495813 (or 10495810 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The spelling of 21018127139793 in words is "twenty-one trillion, eighteen billion, one hundred twenty-seven million, one hundred thirty-nine thousand, seven hundred ninety-three".