21873639379 has 2 divisors, whose sum is σ = 21873639380. Its totient is φ = 21873639378.

The previous prime is 21873639353. The next prime is 21873639413. The reversal of 21873639379 is 97393637812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21873639379 - 2¹³ = 21873631187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21873609379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10936819689 + 10936819690.

It is an arithmetic number, because the mean of its divisors is an integer number (10936819690).

Almost surely, 2^21873639379 is an apocalyptic number.

21873639379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21873639379 is an equidigital number, since it uses as much as digits as its factorization.

21873639379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 58.

The spelling of 21873639379 in words is "twenty-one billion, eight hundred seventy-three million, six hundred thirty-nine thousand, three hundred seventy-nine".