21342143149 has 2 divisors, whose sum is σ = 21342143150. Its totient is φ = 21342143148.

The previous prime is 21342143107. The next prime is 21342143177. The reversal of 21342143149 is 94134124312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18600049924 + 2742093225 = 136382^2 + 52365^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342143149 - 2¹⁵ = 21342110381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342143189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671071574 + 10671071575.

It is an arithmetic number, because the mean of its divisors is an integer number (10671071575).

Almost surely, 2^21342143149 is an apocalyptic number.

It is an amenable number.

21342143149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342143149 is an equidigital number, since it uses as much as digits as its factorization.

21342143149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The spelling of 21342143149 in words is "twenty-one billion, three hundred forty-two million, one hundred forty-three thousand, one hundred forty-nine".