1020121100 has 18 divisors (see below), whose sum is σ = 2213663004. Its totient is φ = 408048400.

The previous prime is 1020121099. The next prime is 1020121111. The reversal of 1020121100 is 11210201.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5100506 + ... + 5100705.

It is an arithmetic number, because the mean of its divisors is an integer number (122981278).

Almost surely, 2^1020121100 is an apocalyptic number.

1020121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020121100 is an abundant number, since it is smaller than the sum of its proper divisors (1193541904).

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

1020121100 is a wasteful number, since it uses less digits than its factorization.

1020121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201225 (or 10201218 counting only the distinct ones).

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

The square root of 1020121100 is about 31939.3346831145. The cubic root of 1020121100 is about 1006.6625452419.

Adding to 1020121100 its reverse (11210201), we get a palindrome (1031331301).

The spelling of 1020121100 in words is "one billion, twenty million, one hundred twenty-one thousand, one hundred".