102220101 has 12 divisors (see below), whose sum is σ = 147770220. Its totient is φ = 68091840.

The previous prime is 102220087. The next prime is 102220123. The reversal of 102220101 is 101022201.

It can be written as a sum of positive squares in 2 ways, for example, as 74909025 + 27311076 = 8655^2 + 5226^2 .

It is not a de Polignac number, because 102220101 - 2⁷ = 102219973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9495 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (12314185).

Almost surely, 2^102220101 is an apocalyptic number.

It is an amenable number.

102220101 is a deficient number, since it is larger than the sum of its proper divisors (45550119).

102220101 is a wasteful number, since it uses less digits than its factorization.

102220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9156 (or 9153 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 102220101 is about 10110.3956895860. The cubic root of 102220101 is about 467.5687046690.

Adding to 102220101 its reverse (101022201), we get a palindrome (203242302).

The spelling of 102220101 in words is "one hundred two million, two hundred twenty thousand, one hundred one".