21774424321 has 4 divisors (see below), whose sum is σ = 23449380052. Its totient is φ = 20099468592.

The previous prime is 21774424319. The next prime is 21774424339. The reversal of 21774424321 is 12342447712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1956823696 + 19817600625 = 44236^2 + 140775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21774424321 - 2¹ = 21774424319 is a prime.

It is a super-2 number, since 2×21774424321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21774424421) 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, 837477846 + ... + 837477871.

It is an arithmetic number, because the mean of its divisors is an integer number (5862345013).

Almost surely, 2^21774424321 is an apocalyptic number.

It is an amenable number.

21774424321 is a deficient number, since it is larger than the sum of its proper divisors (1674955731).

21774424321 is a wasteful number, since it uses less digits than its factorization.

21774424321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674955730.

The product of its digits is 75264, while the sum is 37.

The spelling of 21774424321 in words is "twenty-one billion, seven hundred seventy-four million, four hundred twenty-four thousand, three hundred twenty-one".