21158740704405 has 32 divisors (see below), whose sum is σ = 34123250995200. Its totient is φ = 11194920479232.

The previous prime is 21158740704401. The next prime is 21158740704407. The reversal of 21158740704405 is 50440704785112.

It is not a de Polignac number, because 21158740704405 - 2² = 21158740704401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158740704401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24006361 + ... + 24872129.

It is an arithmetic number, because the mean of its divisors is an integer number (1066351593600).

Almost surely, 2^{21158740704405} is an apocalyptic number.

It is an amenable number.

21158740704405 is a deficient number, since it is larger than the sum of its proper divisors (12964510290795).

21158740704405 is a wasteful number, since it uses less digits than its factorization.

21158740704405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878733.

The product of its (nonzero) digits is 1254400, while the sum is 48.

The spelling of 21158740704405 in words is "twenty-one trillion, one hundred fifty-eight billion, seven hundred forty million, seven hundred four thousand, four hundred five".