106921389 has 4 divisors (see below), whose sum is σ = 142561856. Its totient is φ = 71280924.

The previous prime is 106921369. The next prime is 106921403. The reversal of 106921389 is 983129601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 106921389 - 2¹³ = 106913197 is a prime.

It is a super-2 number, since 2×106921389² = 22864366851378642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106921369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17820229 + ... + 17820234.

It is an arithmetic number, because the mean of its divisors is an integer number (35640464).

Almost surely, 2^106921389 is an apocalyptic number.

It is an amenable number.

106921389 is a deficient number, since it is larger than the sum of its proper divisors (35640467).

106921389 is an equidigital number, since it uses as much as digits as its factorization.

106921389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35640466.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 106921389 is about 10340.2799285126. The cubic root of 106921389 is about 474.6296488981.

The spelling of 106921389 in words is "one hundred six million, nine hundred twenty-one thousand, three hundred eighty-nine".