1021111200100 has 36 divisors (see below), whose sum is σ = 2215911579700. Its totient is φ = 408425996160.

The previous prime is 1021111200023. The next prime is 1021111200149. The reversal of 1021111200100 is 10021111201.

It can be written as a sum of positive squares in 6 ways, for example, as 58373459236 + 962737740864 = 241606^2 + 981192^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2107486 + ... + 2546314.

Almost surely, 2^{1021111200100} is an apocalyptic number.

1021111200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021111200100 is an abundant number, since it is smaller than the sum of its proper divisors (1194800379600).

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

1021111200100 is a wasteful number, since it uses less digits than its factorization.

1021111200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462112 (or 462105 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1021111200100 its reverse (10021111201), we get a palindrome (1031132311301).

The spelling of 1021111200100 in words is "one trillion, twenty-one billion, one hundred eleven million, two hundred thousand, one hundred".