100121010100 has 18 divisors (see below), whose sum is σ = 217262592134. Its totient is φ = 40048404000.

The previous prime is 100121010091. The next prime is 100121010103. The reversal of 100121010100 is 1010121001.

It can be written as a sum of positive squares in 3 ways, for example, as 575712036 + 99545298064 = 23994^2 + 315508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121010103) 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, 500604951 + ... + 500605150.

Almost surely, 2^100121010100 is an apocalyptic number.

100121010100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121010100 is an abundant number, since it is smaller than the sum of its proper divisors (117141582034).

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

100121010100 is a wasteful number, since it uses less digits than its factorization.

100121010100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001210115 (or 1001210108 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 100121010100 its reverse (1010121001), we get a palindrome (101131131101).

The spelling of 100121010100 in words is "one hundred billion, one hundred twenty-one million, ten thousand, one hundred".