1021122100 has 18 divisors (see below), whose sum is σ = 2215835174. Its totient is φ = 408448800.

The previous prime is 1021122077. The next prime is 1021122101. The reversal of 1021122100 is 12211201.

It can be written as a sum of positive squares in 3 ways, for example, as 164506276 + 856615824 = 12826^2 + 29268^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021122101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5105511 + ... + 5105710.

Almost surely, 2^1021122100 is an apocalyptic number.

1021122100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021122100 is an abundant number, since it is smaller than the sum of its proper divisors (1194713074).

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

1021122100 is a wasteful number, since it uses less digits than its factorization.

1021122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10211235 (or 10211228 counting only the distinct ones).

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

The square root of 1021122100 is about 31955.0011735252. The cubic root of 1021122100 is about 1006.9917021735.

Adding to 1021122100 its reverse (12211201), we get a palindrome (1033333301).

The spelling of 1021122100 in words is "one billion, twenty-one million, one hundred twenty-two thousand, one hundred".