2121987002573 has 2 divisors, whose sum is σ = 2121987002574. Its totient is φ = 2121987002572.

The previous prime is 2121987002539. The next prime is 2121987002581. The reversal of 2121987002573 is 3752007891212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1812313673284 + 309673329289 = 1346222^2 + 556483^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121987002573 - 2¹² = 2121986998477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121987002173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060993501286 + 1060993501287.

It is an arithmetic number, because the mean of its divisors is an integer number (1060993501287).

Almost surely, 2^{2121987002573} is an apocalyptic number.

It is an amenable number.

2121987002573 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121987002573 is an equidigital number, since it uses as much as digits as its factorization.

2121987002573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 2121987002573 in words is "two trillion, one hundred twenty-one billion, nine hundred eighty-seven million, two thousand, five hundred seventy-three".