1021100220 has 108 divisors (see below), whose sum is σ = 3603056184. Its totient is φ = 233392320.

The previous prime is 1021100209. The next prime is 1021100263. The reversal of 1021100220 is 220011201.

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

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 49066 + ... + 66705.

Almost surely, 2^1021100220 is an apocalyptic number.

1021100220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021100220 is an abundant number, since it is smaller than the sum of its proper divisors (2581955964).

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

1021100220 is a wasteful number, since it uses less digits than its factorization.

1021100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115800 (or 115788 counting only the distinct ones).

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

The square root of 1021100220 is about 31954.6588152651. The cubic root of 1021100220 is about 1006.9845097147.

Adding to 1021100220 its reverse (220011201), we get a palindrome (1241111421).

The spelling of 1021100220 in words is "one billion, twenty-one million, one hundred thousand, two hundred twenty".