21423424615771 has 2 divisors, whose sum is σ = 21423424615772. Its totient is φ = 21423424615770.

The previous prime is 21423424615661. The next prime is 21423424615793. The reversal of 21423424615771 is 17751642432412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423424615771 - 2¹³ = 21423424607579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21423424615871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711712307885 + 10711712307886.

It is an arithmetic number, because the mean of its divisors is an integer number (10711712307886).

Almost surely, 2^{21423424615771} is an apocalyptic number.

21423424615771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423424615771 is an equidigital number, since it uses as much as digits as its factorization.

21423424615771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 49.

The spelling of 21423424615771 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred twenty-four million, six hundred fifteen thousand, seven hundred seventy-one".