2121000149 has 2 divisors, whose sum is σ = 2121000150. Its totient is φ = 2121000148.

The previous prime is 2121000143. The next prime is 2121000197. The reversal of 2121000149 is 9410001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1763412049 + 357588100 = 41993^2 + 18910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121000149 - 2²⁴ = 2104222933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121000149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121000143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060500074 + 1060500075.

It is an arithmetic number, because the mean of its divisors is an integer number (1060500075).

Almost surely, 2^2121000149 is an apocalyptic number.

It is an amenable number.

2121000149 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121000149 is an equidigital number, since it uses as much as digits as its factorization.

2121000149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 2121000149 is about 46054.3173763329. The cubic root of 2121000149 is about 1284.8336421581.

The spelling of 2121000149 in words is "two billion, one hundred twenty-one million, one hundred forty-nine", and thus it is an aban number.