105219021 has 8 divisors (see below), whose sum is σ = 140414400. Its totient is φ = 70084832.

The previous prime is 105219013. The next prime is 105219029. The reversal of 105219021 is 120912501.

It is an interprime number because it is at equal distance from previous prime (105219013) and next prime (105219029).

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 105219021 - 2³ = 105219013 is a prime.

It is a super-2 number, since 2×105219021² = 22142084760396882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105219029) 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 7 ways as a sum of consecutive naturals, for example, 11121 + ... + 18278.

It is an arithmetic number, because the mean of its divisors is an integer number (17551800).

Almost surely, 2^105219021 is an apocalyptic number.

It is an amenable number.

105219021 is a deficient number, since it is larger than the sum of its proper divisors (35195379).

105219021 is a wasteful number, since it uses less digits than its factorization.

105219021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30595.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 105219021 is about 10257.6323291489. The cubic root of 105219021 is about 472.0971937283.

The spelling of 105219021 in words is "one hundred five million, two hundred nineteen thousand, twenty-one".