106855921 has 4 divisors (see below), whose sum is σ = 107142772. Its totient is φ = 106569072.

The previous prime is 106855919. The next prime is 106855967. The reversal of 106855921 is 129558601.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77000625 + 29855296 = 8775^2 + 5464^2 .

It is a cyclic number.

It is not a de Polignac number, because 106855921 - 2¹ = 106855919 is a prime.

It is a super-2 number, since 2×106855921² = 22836375705516482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106855901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142866 + ... + 143611.

It is an arithmetic number, because the mean of its divisors is an integer number (26785693).

Almost surely, 2^106855921 is an apocalyptic number.

It is an amenable number.

106855921 is a deficient number, since it is larger than the sum of its proper divisors (286851).

106855921 is an equidigital number, since it uses as much as digits as its factorization.

106855921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286850.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 106855921 is about 10337.1137654570. The cubic root of 106855921 is about 474.5327571588.

The spelling of 106855921 in words is "one hundred six million, eight hundred fifty-five thousand, nine hundred twenty-one".