102245021 has 12 divisors (see below), whose sum is σ = 111275220. Its totient is φ = 93872640.

The previous prime is 102245009. The next prime is 102245029. The reversal of 102245021 is 120542201.

It can be written as a sum of positive squares in 6 ways, for example, as 2464900 + 99780121 = 1570^2 + 9989^2 .

It is not a de Polignac number, because 102245021 - 2⁶ = 102244957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102245029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7535 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (9272935).

Almost surely, 2^102245021 is an apocalyptic number.

It is an amenable number.

102245021 is a deficient number, since it is larger than the sum of its proper divisors (9030199).

102245021 is an equidigital number, since it uses as much as digits as its factorization.

102245021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704 (or 8687 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 102245021 is about 10111.6280093761. The cubic root of 102245021 is about 467.6066974097.

Adding to 102245021 its reverse (120542201), we get a palindrome (222787222).

The spelling of 102245021 in words is "one hundred two million, two hundred forty-five thousand, twenty-one".