21403154571727 has 4 divisors (see below), whose sum is σ = 21557134101160. Its totient is φ = 21249175042296.

The previous prime is 21403154571613. The next prime is 21403154571737. The reversal of 21403154571727 is 72717545130412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21403154571727 - 2¹⁹ = 21403154047439 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 (21403154571737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76989764508 + ... + 76989764785.

It is an arithmetic number, because the mean of its divisors is an integer number (5389283525290).

Almost surely, 2^{21403154571727} is an apocalyptic number.

21403154571727 is a deficient number, since it is larger than the sum of its proper divisors (153979529433).

21403154571727 is a wasteful number, since it uses less digits than its factorization.

21403154571727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153979529432.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 21403154571727 in words is "twenty-one trillion, four hundred three billion, one hundred fifty-four million, five hundred seventy-one thousand, seven hundred twenty-seven".