21873609379 has 2 divisors, whose sum is σ = 21873609380. Its totient is φ = 21873609378.

The previous prime is 21873609367. The next prime is 21873609391. The reversal of 21873609379 is 97390637812.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21873609367) and next prime (21873609391).

It is a cyclic number.

It is not a de Polignac number, because 21873609379 - 2¹¹ = 21873607331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21873609179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936804689 + 10936804690.

It is an arithmetic number, because the mean of its divisors is an integer number (10936804690).

Almost surely, 2^21873609379 is an apocalyptic number.

21873609379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21873609379 is an equidigital number, since it uses as much as digits as its factorization.

21873609379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 21873609379 in words is "twenty-one billion, eight hundred seventy-three million, six hundred nine thousand, three hundred seventy-nine".