1021201002100 has 18 divisors (see below), whose sum is σ = 2216006174774. Its totient is φ = 408480400800.

The previous prime is 1021201002091. The next prime is 1021201002121. The reversal of 1021201002100 is 12001021201.

It can be written as a sum of positive squares in 3 ways, for example, as 162991453284 + 858209548816 = 403722^2 + 926396^2 .

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

It is a congruent number.

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, 5106004911 + ... + 5106005110.

Almost surely, 2^{1021201002100} is an apocalyptic number.

1021201002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021201002100 is an abundant number, since it is smaller than the sum of its proper divisors (1194805172674).

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

1021201002100 is a wasteful number, since it uses less digits than its factorization.

1021201002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10212010035 (or 10212010028 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1021201002100 its reverse (12001021201), we get a palindrome (1033202023301).

The spelling of 1021201002100 in words is "one trillion, twenty-one billion, two hundred one million, two thousand, one hundred".