7106816815621 has 2 divisors, whose sum is σ = 7106816815622. Its totient is φ = 7106816815620.

The previous prime is 7106816815619. The next prime is 7106816815691. The reversal of 7106816815621 is 1265186186017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6617601900900 + 489214914721 = 2572470^2 + 699439^2 .

It is a cyclic number.

It is not a de Polignac number, because 7106816815621 - 2¹ = 7106816815619 is a prime.

Together with 7106816815619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7106816815691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3553408407810 + 3553408407811.

It is an arithmetic number, because the mean of its divisors is an integer number (3553408407811).

Almost surely, 2^{7106816815621} is an apocalyptic number.

It is an amenable number.

7106816815621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7106816815621 is an equidigital number, since it uses as much as digits as its factorization.

7106816815621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 7106816815621 in words is "seven trillion, one hundred six billion, eight hundred sixteen million, eight hundred fifteen thousand, six hundred twenty-one".