21941904379 has 2 divisors, whose sum is σ = 21941904380. Its totient is φ = 21941904378.

The previous prime is 21941904367. The next prime is 21941904503. The reversal of 21941904379 is 97340914912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21941904379 - 2¹³ = 21941896187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21941904329) 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, 10970952189 + 10970952190.

It is an arithmetic number, because the mean of its divisors is an integer number (10970952190).

Almost surely, 2^21941904379 is an apocalyptic number.

21941904379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21941904379 is an equidigital number, since it uses as much as digits as its factorization.

21941904379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 21941904379 in words is "twenty-one billion, nine hundred forty-one million, nine hundred four thousand, three hundred seventy-nine".