21143405149 has 2 divisors, whose sum is σ = 21143405150. Its totient is φ = 21143405148.

The previous prime is 21143405131. The next prime is 21143405177. The reversal of 21143405149 is 94150434112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19096476100 + 2046929049 = 138190^2 + 45243^2 .

It is a cyclic number.

It is not a de Polignac number, because 21143405149 - 2⁵ = 21143405117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21143400149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571702574 + 10571702575.

It is an arithmetic number, because the mean of its divisors is an integer number (10571702575).

Almost surely, 2^21143405149 is an apocalyptic number.

It is an amenable number.

21143405149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21143405149 is an equidigital number, since it uses as much as digits as its factorization.

21143405149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 21143405149 in words is "twenty-one billion, one hundred forty-three million, four hundred five thousand, one hundred forty-nine".