2021100110020 has 48 divisors (see below), whose sum is σ = 4424958901440. Its totient is φ = 774740244096.

The previous prime is 2021100110017. The next prime is 2021100110023. The reversal of 2021100110020 is 200110011202.

It is an interprime number because it is at equal distance from previous prime (2021100110017) and next prime (2021100110023).

It is a super-2 number, since 2×2021100110020² (a number of 25 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 2021100109979 and 2021100110006.

It is not an unprimeable number, because it can be changed into a prime (2021100110023) 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, 22125330 + ... + 22216489.

It is an arithmetic number, because the mean of its divisors is an integer number (92186643780).

Almost surely, 2^{2021100110020} is an apocalyptic number.

2021100110020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021100110020 is an abundant number, since it is smaller than the sum of its proper divisors (2403858791420).

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

2021100110020 is a wasteful number, since it uses less digits than its factorization.

2021100110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44341924 (or 44341922 counting only the distinct ones).

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

Adding to 2021100110020 its reverse (200110011202), we get a palindrome (2221210121222).

The spelling of 2021100110020 in words is "two trillion, twenty-one billion, one hundred million, one hundred ten thousand, twenty".