10172021 has 2 divisors, whose sum is σ = 10172022.
Its totient is φ = 10172020.
The previous prime is 10172017. The next prime is 10172053. The reversal of 10172021 is 12027101.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 5808100 + 4363921 = 2410^2 + 2089^2
It is a cyclic number.
It is not a de Polignac number, because 10172021 - 22 = 10172017 is a prime.
It is a super-2 number, since 2×101720212 = 206940022448882, which contains 22 as substring.
It is a Chen prime.
It is a junction number, because it is equal to n+sod(n) for n = 10171987 and 10172005.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (10172221) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086010 + 5086011.
It is an arithmetic number, because the mean of its divisors is an integer number (5086011).
Almost surely, 210172021 is an apocalyptic number.
It is an amenable number.
10172021 is a deficient number, since it is larger than the sum of its proper divisors (1).
10172021 is an equidigital number, since it uses as much as digits as its factorization.
10172021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 28, while the sum is 14.
The square root of 10172021 is about 3189.3605942257.
The cubic root of 10172021 is about 216.6718123696.
Adding to 10172021 its reverse (12027101), we get a palindrome (22199122).
The spelling of 10172021 in words is "ten million, one hundred seventy-two thousand, twenty-one".