103522021 has 4 divisors (see below), whose sum is σ = 103659532. Its totient is φ = 103384512.

The previous prime is 103522009. The next prime is 103522031. The reversal of 103522021 is 120225301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35640900 + 67881121 = 5970^2 + 8239^2 .

It is a cyclic number.

It is not a de Polignac number, because 103522021 - 2¹¹ = 103519973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 103521986 and 103522004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103522031) 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, 67620 + ... + 69133.

It is an arithmetic number, because the mean of its divisors is an integer number (25914883).

Almost surely, 2^103522021 is an apocalyptic number.

It is an amenable number.

103522021 is a deficient number, since it is larger than the sum of its proper divisors (137511).

103522021 is an equidigital number, since it uses as much as digits as its factorization.

103522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137510.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 103522021 is about 10174.5771902325. The cubic root of 103522021 is about 469.5453896007.

Adding to 103522021 its reverse (120225301), we get a palindrome (223747322).

The spelling of 103522021 in words is "one hundred three million, five hundred twenty-two thousand, twenty-one".