106921681 has 8 divisors (see below), whose sum is σ = 109137920. Its totient is φ = 104727168.

The previous prime is 106921673. The next prime is 106921699. The reversal of 106921681 is 186129601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 106921681 - 2³ = 106921673 is a prime.

It is a super-2 number, since 2×106921681² = 22864491735731522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106921631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4705 + ... + 15361.

It is an arithmetic number, because the mean of its divisors is an integer number (13642240).

Almost surely, 2^106921681 is an apocalyptic number.

It is an amenable number.

106921681 is a deficient number, since it is larger than the sum of its proper divisors (2216239).

106921681 is a wasteful number, since it uses less digits than its factorization.

106921681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10863.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 106921681 is about 10340.2940480433. The cubic root of 106921681 is about 474.6300809654.

The spelling of 106921681 in words is "one hundred six million, nine hundred twenty-one thousand, six hundred eighty-one".