1021222200 has 192 divisors, whose sum is σ = 3283227360. Its totient is φ = 262379520.

The previous prime is 1021222187. The next prime is 1021222207. The reversal of 1021222200 is 22221201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021222207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3485254 + ... + 3485546.

Almost surely, 2^1021222200 is an apocalyptic number.

1021222200 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 1021222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1641613680).

1021222200 is an abundant number, since it is smaller than the sum of its proper divisors (2262005160).

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

1021222200 is a wasteful number, since it uses less digits than its factorization.

1021222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1021222200 is about 31956.5674001448. The cubic root of 1021222200 is about 1007.0246060335.

Adding to 1021222200 its reverse (22221201), we get a palindrome (1043443401).

Subtracting from 1021222200 its reverse (22221201), we obtain a palindrome (999000999).

The spelling of 1021222200 in words is "one billion, twenty-one million, two hundred twenty-two thousand, two hundred".