21145142243279 has 2 divisors, whose sum is σ = 21145142243280. Its totient is φ = 21145142243278.

The previous prime is 21145142243227. The next prime is 21145142243369. The reversal of 21145142243279 is 97234224154112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21145142243279 - 2¹² = 21145142239183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145142243779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572571121639 + 10572571121640.

It is an arithmetic number, because the mean of its divisors is an integer number (10572571121640).

Almost surely, 2^{21145142243279} is an apocalyptic number.

21145142243279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145142243279 is an equidigital number, since it uses as much as digits as its factorization.

21145142243279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 47.

The spelling of 21145142243279 in words is "twenty-one trillion, one hundred forty-five billion, one hundred forty-two million, two hundred forty-three thousand, two hundred seventy-nine".