106646821091 has 2 divisors, whose sum is σ = 106646821092. Its totient is φ = 106646821090.

The previous prime is 106646821087. The next prime is 106646821109. The reversal of 106646821091 is 190128646601.

Together with next prime (106646821109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 106646821091 - 2² = 106646821087 is a prime.

It is a super-2 number, since 2×106646821091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (106646821591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53323410545 + 53323410546.

It is an arithmetic number, because the mean of its divisors is an integer number (53323410546).

Almost surely, 2^106646821091 is an apocalyptic number.

106646821091 is a deficient number, since it is larger than the sum of its proper divisors (1).

106646821091 is an equidigital number, since it uses as much as digits as its factorization.

106646821091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 106646821091 in words is "one hundred six billion, six hundred forty-six million, eight hundred twenty-one thousand, ninety-one".