102120220 has 12 divisors (see below), whose sum is σ = 214452504. Its totient is φ = 40848080.

The previous prime is 102120203. The next prime is 102120301. The reversal of 102120220 is 22021201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 102120197 and 102120206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2552986 + ... + 2553025.

It is an arithmetic number, because the mean of its divisors is an integer number (17871042).

Almost surely, 2^102120220 is an apocalyptic number.

102120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102120220 is an abundant number, since it is smaller than the sum of its proper divisors (112332284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

102120220 is a wasteful number, since it uses less digits than its factorization.

102120220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5106020 (or 5106018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 102120220 is about 10105.4549625437. The cubic root of 102120220 is about 467.4163652613.

Adding to 102120220 its reverse (22021201), we get a palindrome (124141421).

The spelling of 102120220 in words is "one hundred two million, one hundred twenty thousand, two hundred twenty".