21311003149 has 2 divisors, whose sum is σ = 21311003150. Its totient is φ = 21311003148.

The previous prime is 21311003143. The next prime is 21311003221. The reversal of 21311003149 is 94130011312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18029775625 + 3281227524 = 134275^2 + 57282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311003149 - 2³ = 21311003141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311003141) 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, 10655501574 + 10655501575.

It is an arithmetic number, because the mean of its divisors is an integer number (10655501575).

Almost surely, 2^21311003149 is an apocalyptic number.

It is an amenable number.

21311003149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311003149 is an equidigital number, since it uses as much as digits as its factorization.

21311003149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21311003149 in words is "twenty-one billion, three hundred eleven million, three thousand, one hundred forty-nine".