105772021 has 4 divisors (see below), whose sum is σ = 105856000. Its totient is φ = 105688044.

The previous prime is 105772003. The next prime is 105772063. The reversal of 105772021 is 120277501.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 105772021 - 2⁵ = 105771989 is a prime.

It is a super-2 number, since 2×105772021² = 22375440852848882, 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 (105772621) 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, 40071 + ... + 42628.

It is an arithmetic number, because the mean of its divisors is an integer number (26464000).

Almost surely, 2^105772021 is an apocalyptic number.

It is an amenable number.

105772021 is a deficient number, since it is larger than the sum of its proper divisors (83979).

105772021 is an equidigital number, since it uses as much as digits as its factorization.

105772021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83978.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 105772021 is about 10284.5525425271. The cubic root of 105772021 is about 472.9228166623.

The spelling of 105772021 in words is "one hundred five million, seven hundred seventy-two thousand, twenty-one".