100021001020 has 24 divisors (see below), whose sum is σ = 210155374800. Its totient is φ = 39987205632.

The previous prime is 100021000997. The next prime is 100021001021. The reversal of 100021001020 is 20100120001.

It is a junction number, because it is equal to n+sod(n) for n = 100021000994 and 100021001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021001021) 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, 1285950 + ... + 1361509.

It is an arithmetic number, because the mean of its divisors is an integer number (8756473950).

Almost surely, 2^100021001020 is an apocalyptic number.

100021001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100021001020 is an abundant number, since it is smaller than the sum of its proper divisors (110134373780).

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

100021001020 is a wasteful number, since it uses less digits than its factorization.

100021001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649357 (or 2649355 counting only the distinct ones).

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

Adding to 100021001020 its reverse (20100120001), we get a palindrome (120121121021).

The spelling of 100021001020 in words is "one hundred billion, twenty-one million, one thousand, twenty".