100001021020 has 48 divisors (see below), whose sum is σ = 216454680288. Its totient is φ = 38784936960.

The previous prime is 100001020969. The next prime is 100001021023. The reversal of 100001021020 is 20120100001.

It is a junction number, because it is equal to n+sod(n) for n = 100001020994 and 100001021012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100001021023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 306561 + ... + 542200.

It is an arithmetic number, because the mean of its divisors is an integer number (4509472506).

Almost surely, 2^100001021020 is an apocalyptic number.

100001021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100001021020 is an abundant number, since it is smaller than the sum of its proper divisors (116453659268).

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

100001021020 is a wasteful number, since it uses less digits than its factorization.

100001021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848950 (or 848948 counting only the distinct ones).

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

Adding to 100001021020 its reverse (20120100001), we get a palindrome (120121121021).

The spelling of 100001021020 in words is "one hundred billion, one million, twenty-one thousand, twenty".