102203021 has 4 divisors (see below), whose sum is σ = 102301500. Its totient is φ = 102104544.

The previous prime is 102202987. The next prime is 102203029. The reversal of 102203021 is 120302201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120302201 = 3209 ⋅37489.

It can be written as a sum of positive squares in 2 ways, for example, as 79744900 + 22458121 = 8930^2 + 4739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102203021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102202993 and 102203011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102203029) 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, 47666 + ... + 49763.

It is an arithmetic number, because the mean of its divisors is an integer number (25575375).

Almost surely, 2^102203021 is an apocalyptic number.

It is an amenable number.

102203021 is a deficient number, since it is larger than the sum of its proper divisors (98479).

102203021 is an equidigital number, since it uses as much as digits as its factorization.

102203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98478.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 102203021 is about 10109.5509791484. The cubic root of 102203021 is about 467.5426611340.

Adding to 102203021 its reverse (120302201), we get a palindrome (222505222).

The spelling of 102203021 in words is "one hundred two million, two hundred three thousand, twenty-one".