1021220200 has 192 divisors, whose sum is σ = 3188545920. Its totient is φ = 293760000.

The previous prime is 1021220143. The next prime is 1021220257. The reversal of 1021220200 is 20221201.

It is an interprime number because it is at equal distance from previous prime (1021220143) and next prime (1021220257).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 197650 + ... + 202750.

It is an arithmetic number, because the mean of its divisors is an integer number (16607010).

Almost surely, 2^1021220200 is an apocalyptic number.

1021220200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021220200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1594272960).

1021220200 is an abundant number, since it is smaller than the sum of its proper divisors (2167325720).

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

1021220200 is a wasteful number, since it uses less digits than its factorization.

1021220200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5148 (or 5139 counting only the distinct ones).

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

The square root of 1021220200 is about 31956.5361076572. The cubic root of 1021220200 is about 1007.0239486347.

Adding to 1021220200 its reverse (20221201), we get a palindrome (1041441401).

The spelling of 1021220200 in words is "one billion, twenty-one million, two hundred twenty thousand, two hundred".