102100220 has 24 divisors (see below), whose sum is σ = 223733664. Its totient is φ = 39064256.

The previous prime is 102100211. The next prime is 102100223. The reversal of 102100220 is 22001201.

It is a junction number, because it is equal to n+sod(n) for n = 102100198 and 102100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102100223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110519 + ... + 111438.

It is an arithmetic number, because the mean of its divisors is an integer number (9322236).

Almost surely, 2^102100220 is an apocalyptic number.

102100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102100220 is an abundant number, since it is smaller than the sum of its proper divisors (121633444).

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

102100220 is a wasteful number, since it uses less digits than its factorization.

102100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221989 (or 221987 counting only the distinct ones).

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

The square root of 102100220 is about 10104.4653495373. The cubic root of 102100220 is about 467.3858491446.

Adding to 102100220 its reverse (22001201), we get a palindrome (124101421).

The spelling of 102100220 in words is "one hundred two million, one hundred thousand, two hundred twenty".