3849952490821 has 2 divisors, whose sum is σ = 3849952490822. Its totient is φ = 3849952490820.

The previous prime is 3849952490729. The next prime is 3849952490833. The reversal of 3849952490821 is 1280942599483.

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., 3776395457025 + 73557033796 = 1943295^2 + 271214^2 .

It is a cyclic number.

It is not a de Polignac number, because 3849952490821 - 2¹⁹ = 3849951966533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3849952490521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1924976245410 + 1924976245411.

It is an arithmetic number, because the mean of its divisors is an integer number (1924976245411).

Almost surely, 2^{3849952490821} is an apocalyptic number.

It is an amenable number.

3849952490821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3849952490821 is an equidigital number, since it uses as much as digits as its factorization.

3849952490821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44789760, while the sum is 64.

The spelling of 3849952490821 in words is "three trillion, eight hundred forty-nine billion, nine hundred fifty-two million, four hundred ninety thousand, eight hundred twenty-one".