105151021 has 4 divisors (see below), whose sum is σ = 105202944. Its totient is φ = 105099100.

The previous prime is 105150989. The next prime is 105151051. The reversal of 105151021 is 120151501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120151501 = 4021 ⋅29881.

It is a cyclic number.

It is not a de Polignac number, because 105151021 - 2⁵ = 105150989 is a prime.

It is a super-3 number, since 3×105151021³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105150986 and 105151004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105151051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22795 + ... + 27016.

It is an arithmetic number, because the mean of its divisors is an integer number (26300736).

Almost surely, 2^105151021 is an apocalyptic number.

It is an amenable number.

105151021 is a deficient number, since it is larger than the sum of its proper divisors (51923).

105151021 is an equidigital number, since it uses as much as digits as its factorization.

105151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51922.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 105151021 is about 10254.3171883846. The cubic root of 105151021 is about 471.9954709060.

The spelling of 105151021 in words is "one hundred five million, one hundred fifty-one thousand, twenty-one".