102021220 has 24 divisors (see below), whose sum is σ = 244851264. Its totient is φ = 34978656.

The previous prime is 102021197. The next prime is 102021251. The reversal of 102021220 is 22120201.

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 = 102021197 and 102021206.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 364222 + ... + 364501.

It is an arithmetic number, because the mean of its divisors is an integer number (10202136).

Almost surely, 2^102021220 is an apocalyptic number.

102021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021220 is an abundant number, since it is smaller than the sum of its proper divisors (142830044).

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

102021220 is a wasteful number, since it uses less digits than its factorization.

102021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728739 (or 728737 counting only the distinct ones).

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

The square root of 102021220 is about 10100.5554302721. Note that the first 3 decimals coincide. The cubic root of 102021220 is about 467.2652715090.

Adding to 102021220 its reverse (22120201), we get a palindrome (124141421).

The spelling of 102021220 in words is "one hundred two million, twenty-one thousand, two hundred twenty".