1011222100 has 72 divisors (see below), whose sum is σ = 2532837888. Its totient is φ = 343248000.

The previous prime is 1011222031. The next prime is 1011222131. The reversal of 1011222100 is 12221101.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63549 + ... + 77851.

It is an arithmetic number, because the mean of its divisors is an integer number (35178304).

Almost surely, 2^1011222100 is an apocalyptic number.

1011222100 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 1011222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1266418944).

1011222100 is an abundant number, since it is smaller than the sum of its proper divisors (1521615788).

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

1011222100 is a wasteful number, since it uses less digits than its factorization.

1011222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425 (or 14418 counting only the distinct ones).

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

The square root of 1011222100 is about 31799.7185522136. The cubic root of 1011222100 is about 1003.7267937545.

Adding to 1011222100 its reverse (12221101), we get a palindrome (1023443201).

Subtracting from 1011222100 its reverse (12221101), we obtain a palindrome (999000999).

It can be divided in two parts, 101 and 1222100, that multiplied together give a square (123432100 = 11110²).

The spelling of 1011222100 in words is "one billion, eleven million, two hundred twenty-two thousand, one hundred".