1967974706021 has 4 divisors (see below), whose sum is σ = 1968041066700. Its totient is φ = 1967908345344.

The previous prime is 1967974706003. The next prime is 1967974706039. The reversal of 1967974706021 is 1206074797691.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1967974706003) and next prime (1967974706039).

It can be written as a sum of positive squares in 2 ways, for example, as 923002132900 + 1044972573121 = 960730^2 + 1022239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1967974706021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1967974706081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33135836 + ... + 33195173.

It is an arithmetic number, because the mean of its divisors is an integer number (492010266675).

Almost surely, 2^{1967974706021} is an apocalyptic number.

It is an amenable number.

1967974706021 is a deficient number, since it is larger than the sum of its proper divisors (66360679).

1967974706021 is an equidigital number, since it uses as much as digits as its factorization.

1967974706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66360678.

The product of its (nonzero) digits is 8001504, while the sum is 59.

The spelling of 1967974706021 in words is "one trillion, nine hundred sixty-seven billion, nine hundred seventy-four million, seven hundred six thousand, twenty-one".