102220765 has 4 divisors (see below), whose sum is σ = 122664924. Its totient is φ = 81776608.

The previous prime is 102220753. The next prime is 102220777. The reversal of 102220765 is 567022201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567022201 = 16963 ⋅33427.

It is an interprime number because it is at equal distance from previous prime (102220753) and next prime (102220777).

It can be written as a sum of positive squares in 2 ways, for example, as 54375876 + 47844889 = 7374^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 102220765 - 2¹⁹ = 101696477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10222072 + ... + 10222081.

It is an arithmetic number, because the mean of its divisors is an integer number (30666231).

Almost surely, 2^102220765 is an apocalyptic number.

It is an amenable number.

102220765 is a deficient number, since it is larger than the sum of its proper divisors (20444159).

102220765 is an equidigital number, since it uses as much as digits as its factorization.

102220765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20444158.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 102220765 is about 10110.4285270210. The cubic root of 102220765 is about 467.5697170757.

Adding to 102220765 its reverse (567022201), we get a palindrome (669242966).

The spelling of 102220765 in words is "one hundred two million, two hundred twenty thousand, seven hundred sixty-five".