2021100331212 has 144 divisors (see below), whose sum is σ = 5602431394560. Its totient is φ = 612410730624.

The previous prime is 2021100331181. The next prime is 2021100331213. The reversal of 2021100331212 is 2121330011202.

2021100331212 is a `hidden beast` number, since 2 + 0 + 21 + 100 + 331 + 212 = 666.

It is a super-2 number, since 2×2021100331212² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2021100331213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 550239 + ... + 2084457.

Almost surely, 2^{2021100331212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021100331212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2801215697280).

2021100331212 is an abundant number, since it is smaller than the sum of its proper divisors (3581331063348).

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

2021100331212 is a wasteful number, since it uses less digits than its factorization.

2021100331212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534332 (or 1534327 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2021100331212 its reverse (2121330011202), we get a palindrome (4142430342414).

The spelling of 2021100331212 in words is "two trillion, twenty-one billion, one hundred million, three hundred thirty-one thousand, two hundred twelve".