102100100 has 18 divisors (see below), whose sum is σ = 221557434. Its totient is φ = 40840000.

The previous prime is 102100099. The next prime is 102100111. The reversal of 102100100 is 1001201.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20811844 + 81288256 = 4562^2 + 9016^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

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, 510401 + ... + 510600.

Almost surely, 2^102100100 is an apocalyptic number.

102100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102100100 is an abundant number, since it is smaller than the sum of its proper divisors (119457334).

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

102100100 is a wasteful number, since it uses less digits than its factorization.

102100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021015 (or 1021008 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 102100100 is about 10104.4594115668. The cubic root of 102100100 is about 467.3856660359.

Adding to 102100100 its reverse (1001201), we get a palindrome (103101301).

The spelling of 102100100 in words is "one hundred two million, one hundred thousand, one hundred".