21836690005405 has 16 divisors (see below), whose sum is σ = 28586497661568. Its totient is φ = 15881070600000.

The previous prime is 21836690005397. The next prime is 21836690005477. The reversal of 21836690005405 is 50450009663812.

It is not a de Polignac number, because 21836690005405 - 2³ = 21836690005397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3728155 + ... + 7587655.

It is an arithmetic number, because the mean of its divisors is an integer number (1786656103848).

Almost surely, 2^{21836690005405} is an apocalyptic number.

It is an amenable number.

21836690005405 is a deficient number, since it is larger than the sum of its proper divisors (6749807656163).

21836690005405 is a wasteful number, since it uses less digits than its factorization.

21836690005405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962388.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 21836690005405 in words is "twenty-one trillion, eight hundred thirty-six billion, six hundred ninety million, five thousand, four hundred five".