21053821184239 has 2 divisors, whose sum is σ = 21053821184240. Its totient is φ = 21053821184238.

The previous prime is 21053821184177. The next prime is 21053821184329. The reversal of 21053821184239 is 93248112835012.

Together with next prime (21053821184329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21053821184239 - 2⁷ = 21053821184111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21053821184192 and 21053821184201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053821184639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526910592119 + 10526910592120.

It is an arithmetic number, because the mean of its divisors is an integer number (10526910592120).

Almost surely, 2^{21053821184239} is an apocalyptic number.

21053821184239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053821184239 is an equidigital number, since it uses as much as digits as its factorization.

21053821184239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 21053821184239 in words is "twenty-one trillion, fifty-three billion, eight hundred twenty-one million, one hundred eighty-four thousand, two hundred thirty-nine".