1021120100 has 216 divisors, whose sum is σ = 3004849344. Its totient is φ = 290880000.

The previous prime is 1021120099. The next prime is 1021120103. The reversal of 1021120100 is 10211201.

It is not an unprimeable number, because it can be changed into a prime (1021120103) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10110050 + ... + 10110150.

Almost surely, 2^1021120100 is an apocalyptic number.

1021120100 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 1021120100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502424672).

1021120100 is an abundant number, since it is smaller than the sum of its proper divisors (1983729244).

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

1021120100 is a wasteful number, since it uses less digits than its factorization.

1021120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021120100 is about 31954.9698795039. The cubic root of 1021120100 is about 1006.9910447318.

Adding to 1021120100 its reverse (10211201), we get a palindrome (1031331301).

1021120100 divided by its reverse (10211201) gives a square (100 = 10²).

It can be divided in two parts, 1021 and 120100, that added together give a palindrome (121121).

The spelling of 1021120100 in words is "one billion, twenty-one million, one hundred twenty thousand, one hundred".