1022121100 has 144 divisors (see below), whose sum is σ = 2978309376. Its totient is φ = 294048000.

The previous prime is 1022121097. The next prime is 1022121151. The reversal of 1022121100 is 11212201.

1022121100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94995 + ... + 105205.

It is an arithmetic number, because the mean of its divisors is an integer number (20682704).

Almost surely, 2^1022121100 is an apocalyptic number.

1022121100 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 1022121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1489154688).

1022121100 is an abundant number, since it is smaller than the sum of its proper divisors (1956188276).

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

1022121100 is a wasteful number, since it uses less digits than its factorization.

1022121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10256 (or 10249 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1022121100 is about 31970.6287082378. The cubic root of 1022121100 is about 1007.3199870492.

Adding to 1022121100 its reverse (11212201), we get a palindrome (1033333301).

The spelling of 1022121100 in words is "one billion, twenty-two million, one hundred twenty-one thousand, one hundred".