1010002100020 has 24 divisors (see below), whose sum is σ = 2121338535624. Its totient is φ = 403937197056.

The previous prime is 1010002099973. The next prime is 1010002100027. The reversal of 1010002100020 is 200012000101.

It can be written as a sum of positive squares in 4 ways, for example, as 2604469156 + 1007397630864 = 51034^2 + 1003692^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1010002099976 and 1010002100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010002100027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3847449 + ... + 4101568.

It is an arithmetic number, because the mean of its divisors is an integer number (88389105651).

Almost surely, 2^{1010002100020} is an apocalyptic number.

1010002100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1010002100020 is an abundant number, since it is smaller than the sum of its proper divisors (1111336435604).

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

1010002100020 is a wasteful number, since it uses less digits than its factorization.

1010002100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7955379 (or 7955377 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1010002100020 its reverse (200012000101), we get a palindrome (1210014100121).

The spelling of 1010002100020 in words is "one trillion, ten billion, two million, one hundred thousand, twenty".