106821151 has 4 divisors (see below), whose sum is σ = 107026704. Its totient is φ = 106615600.

The previous prime is 106821137. The next prime is 106821167. The reversal of 106821151 is 151128601.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106821151 is a prime.

It is a super-2 number, since 2×106821151² = 22821516601929602, 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 (106821101) 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, 101995 + ... + 103036.

It is an arithmetic number, because the mean of its divisors is an integer number (26756676).

Almost surely, 2^106821151 is an apocalyptic number.

106821151 is a deficient number, since it is larger than the sum of its proper divisors (205553).

106821151 is an equidigital number, since it uses as much as digits as its factorization.

106821151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205552.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 106821151 is about 10335.4318245538. The cubic root of 106821151 is about 474.4812819458.

Adding to 106821151 its reverse (151128601), we get a palindrome (257949752).

The spelling of 106821151 in words is "one hundred six million, eight hundred twenty-one thousand, one hundred fifty-one".