102221220 has 24 divisors (see below), whose sum is σ = 286219584. Its totient is φ = 27258976.

The previous prime is 102221213. The next prime is 102221237. The reversal of 102221220 is 22122201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 102221196 and 102221205.

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 7 ways as a sum of consecutive naturals, for example, 851784 + ... + 851903.

It is an arithmetic number, because the mean of its divisors is an integer number (11925816).

Almost surely, 2^102221220 is an apocalyptic number.

102221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102221220 is an abundant number, since it is smaller than the sum of its proper divisors (183998364).

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

102221220 is a wasteful number, since it uses less digits than its factorization.

102221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703699 (or 1703697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 102221220 is about 10110.4510285150. The cubic root of 102221220 is about 467.5704108157.

Adding to 102221220 its reverse (22122201), we get a palindrome (124343421).

The spelling of 102221220 in words is "one hundred two million, two hundred twenty-one thousand, two hundred twenty".