1020221100 has 54 divisors (see below), whose sum is σ = 3197829180. Its totient is φ = 272058720.

The previous prime is 1020221087. The next prime is 1020221101. The reversal of 1020221100 is 11220201.

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

It is not an unprimeable number, because it can be changed into a prime (1020221101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 565890 + ... + 567689.

Almost surely, 2^1020221100 is an apocalyptic number.

1020221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020221100 is an abundant number, since it is smaller than the sum of its proper divisors (2177608080).

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

1020221100 is a wasteful number, since it uses less digits than its factorization.

1020221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133599 (or 1133589 counting only the distinct ones).

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

The square root of 1020221100 is about 31940.9001125516. The cubic root of 1020221100 is about 1006.6954377306.

Adding to 1020221100 its reverse (11220201), we get a palindrome (1031441301).

The spelling of 1020221100 in words is "one billion, twenty million, two hundred twenty-one thousand, one hundred".