21444144131429 has 2 divisors, whose sum is σ = 21444144131430. Its totient is φ = 21444144131428.

The previous prime is 21444144131411. The next prime is 21444144131441. The reversal of 21444144131429 is 92413144144412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18703877740804 + 2740266390625 = 4324798^2 + 1655375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444144131429 - 2²⁴ = 21444127354213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21444144131429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444144181429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722072065714 + 10722072065715.

It is an arithmetic number, because the mean of its divisors is an integer number (10722072065715).

Almost surely, 2^{21444144131429} is an apocalyptic number.

It is an amenable number.

21444144131429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444144131429 is an equidigital number, since it uses as much as digits as its factorization.

21444144131429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 44.

The spelling of 21444144131429 in words is "twenty-one trillion, four hundred forty-four billion, one hundred forty-four million, one hundred thirty-one thousand, four hundred twenty-nine".