21409161127 has 4 divisors (see below), whose sum is σ = 21429532456. Its totient is φ = 21388789800.

The previous prime is 21409161077. The next prime is 21409161133. The reversal of 21409161127 is 72116190412.

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 21409161127 - 2¹⁹ = 21408636839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21409161092 and 21409161101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409167127) 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, 10184088 + ... + 10186189.

It is an arithmetic number, because the mean of its divisors is an integer number (5357383114).

Almost surely, 2^21409161127 is an apocalyptic number.

21409161127 is a deficient number, since it is larger than the sum of its proper divisors (20371329).

21409161127 is a wasteful number, since it uses less digits than its factorization.

21409161127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371328.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 21409161127 in words is "twenty-one billion, four hundred nine million, one hundred sixty-one thousand, one hundred twenty-seven".