70673737021 has 2 divisors, whose sum is σ = 70673737022. Its totient is φ = 70673737020.

The previous prime is 70673737009. The next prime is 70673737027. The reversal of 70673737021 is 12073737607.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44643464100 + 26030272921 = 211290^2 + 161339^2 .

It is a cyclic number.

It is not a de Polignac number, because 70673737021 - 2¹¹ = 70673734973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70673737027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35336868510 + 35336868511.

It is an arithmetic number, because the mean of its divisors is an integer number (35336868511).

Almost surely, 2^70673737021 is an apocalyptic number.

It is an amenable number.

70673737021 is a deficient number, since it is larger than the sum of its proper divisors (1).

70673737021 is an equidigital number, since it uses as much as digits as its factorization.

70673737021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259308, while the sum is 43.

The spelling of 70673737021 in words is "seventy billion, six hundred seventy-three million, seven hundred thirty-seven thousand, twenty-one".