102103021 has 8 divisors (see below), whose sum is σ = 103412088. Its totient is φ = 100800000.
The previous prime is 102103013. The next prime is 102103039. The reversal of 102103021 is 120301201.
It can be written as a sum of positive squares in 4 ways, for example, as 37380996 + 64722025 = 6114^2 + 8045^2 .
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 102103021 - 23 = 102103013 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 102102989 and 102103007.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (102103051) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39241 + ... + 41761.
It is an arithmetic number, because the mean of its divisors is an integer number (12926511).
Almost surely, 2102103021 is an apocalyptic number.
It is an amenable number.
102103021 is a deficient number, since it is larger than the sum of its proper divisors (1309067).
102103021 is a wasteful number, since it uses less digits than its factorization.
102103021 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3023.
The product of its (nonzero) digits is 12, while the sum is 10.
The square root of 102103021 is about 10104.6039506752. The cubic root of 102103021 is about 467.3901231667.
Adding to 102103021 its reverse (120301201), we get a palindrome (222404222).
It can be divided in two parts, 10210 and 3021, that added together give a palindrome (13231).
The spelling of 102103021 in words is "one hundred two million, one hundred three thousand, twenty-one".
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