3957441021973 has 2 divisors, whose sum is σ = 3957441021974. Its totient is φ = 3957441021972.

The previous prime is 3957441021949. The next prime is 3957441022009. The reversal of 3957441021973 is 3791201447593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3944740182769 + 12700839204 = 1986137^2 + 112698^2 .

It is a cyclic number.

It is not a de Polignac number, because 3957441021973 - 2¹³ = 3957441013781 is a prime.

It is a super-2 number, since 2×3957441021973² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3957441021473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1978720510986 + 1978720510987.

It is an arithmetic number, because the mean of its divisors is an integer number (1978720510987).

Almost surely, 2^{3957441021973} is an apocalyptic number.

It is an amenable number.

3957441021973 is a deficient number, since it is larger than the sum of its proper divisors (1).

3957441021973 is an equidigital number, since it uses as much as digits as its factorization.

3957441021973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 3957441021973 in words is "three trillion, nine hundred fifty-seven billion, four hundred forty-one million, twenty-one thousand, nine hundred seventy-three".