21324127577 has 4 divisors (see below), whose sum is σ = 21435772416. Its totient is φ = 21212482740.

The previous prime is 21324127567. The next prime is 21324127607. The reversal of 21324127577 is 77572142312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21324127577 - 2¹⁰ = 21324126553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324127567) 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, 55822133 + ... + 55822514.

It is an arithmetic number, because the mean of its divisors is an integer number (5358943104).

Almost surely, 2^21324127577 is an apocalyptic number.

It is an amenable number.

21324127577 is a deficient number, since it is larger than the sum of its proper divisors (111644839).

21324127577 is a wasteful number, since it uses less digits than its factorization.

21324127577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111644838.

The product of its digits is 164640, while the sum is 41.

Adding to 21324127577 its reverse (77572142312), we get a palindrome (98896269889).

The spelling of 21324127577 in words is "twenty-one billion, three hundred twenty-four million, one hundred twenty-seven thousand, five hundred seventy-seven".