106821290 has 8 divisors (see below), whose sum is σ = 192278340. Its totient is φ = 42728512.

The previous prime is 106821263. The next prime is 106821301. The reversal of 106821290 is 92128601.

It can be written as a sum of positive squares in 2 ways, for example, as 98863249 + 7958041 = 9943^2 + 2821^2 .

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

It is a super-2 number, since 2×106821290² = 22821575994528200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5341055 + ... + 5341074.

Almost surely, 2^106821290 is an apocalyptic number.

106821290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

106821290 is a deficient number, since it is larger than the sum of its proper divisors (85457050).

106821290 is a wasteful number, since it uses less digits than its factorization.

106821290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682136.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 106821290 is about 10335.4385489925. The cubic root of 106821290 is about 474.4814877505.

Adding to 106821290 its reverse (92128601), we get a palindrome (198949891).

The spelling of 106821290 in words is "one hundred six million, eight hundred twenty-one thousand, two hundred ninety".