1102021 has 2 divisors, whose sum is σ = 1102022.
Its totient is φ = 1102020.
The previous prime is 1102007. The next prime is 1102027. The reversal of 1102021 is 1202011.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1079521 + 22500 = 1039^2 + 150^2
It is a cyclic number.
It is not a de Polignac number, because 1102021 - 29 = 1101509 is a prime.
1102021 is a lucky number.
It is a junction number, because it is equal to n+sod(n) for n = 1101995 and 1102013.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1102027) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 551010 + 551011.
It is an arithmetic number, because the mean of its divisors is an integer number (551011).
21102021 is an apocalyptic number.
It is an amenable number.
1102021 is a deficient number, since it is larger than the sum of its proper divisors (1).
1102021 is an equidigital number, since it uses as much as digits as its factorization.
1102021 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 4, while the sum is 7.
The square root of 1102021 is about 1049.7718799816.
The cubic root of 1102021 is about 103.2911922048.
Adding to 1102021 its reverse (1202011), we get a palindrome (2304032).
The spelling of 1102021 in words is "one million, one hundred two thousand, twenty-one".