100021212020 has 48 divisors (see below), whose sum is σ = 213660357120. Its totient is φ = 39320113536.

The previous prime is 100021212017. The next prime is 100021212089. The reversal of 100021212020 is 20212120001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 100021211992 and 100021212010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5812349 + ... + 5829531.

It is an arithmetic number, because the mean of its divisors is an integer number (4451257440).

Almost surely, 2^100021212020 is an apocalyptic number.

100021212020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100021212020 is an abundant number, since it is smaller than the sum of its proper divisors (113639145100).

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

100021212020 is a wasteful number, since it uses less digits than its factorization.

100021212020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22184 (or 22182 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100021212020 its reverse (20212120001), we get a palindrome (120233332021).

The spelling of 100021212020 in words is "one hundred billion, twenty-one million, two hundred twelve thousand, twenty".