21474229409 has 2 divisors, whose sum is σ = 21474229410. Its totient is φ = 21474229408.

The previous prime is 21474229397. The next prime is 21474229421. The reversal of 21474229409 is 90492247412.

It is a balanced prime because it is at equal distance from previous prime (21474229397) and next prime (21474229421).

It can be written as a sum of positive squares in only one way, i.e., 11488624225 + 9985605184 = 107185^2 + 99928^2 .

It is a cyclic number.

It is not a de Polignac number, because 21474229409 - 2¹⁶ = 21474163873 is a prime.

It is a super-2 number, since 2×21474229409² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21474229409.

It is not a weakly prime, because it can be changed into another prime (21474222409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10737114704 + 10737114705.

It is an arithmetic number, because the mean of its divisors is an integer number (10737114705).

Almost surely, 2^21474229409 is an apocalyptic number.

It is an amenable number.

21474229409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21474229409 is an equidigital number, since it uses as much as digits as its factorization.

21474229409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21474229409 in words is "twenty-one billion, four hundred seventy-four million, two hundred twenty-nine thousand, four hundred nine".