2021001212100 has 72 divisors (see below), whose sum is σ = 6297232506880. Its totient is φ = 497477220480.

The previous prime is 2021001212081. The next prime is 2021001212123. The reversal of 2021001212100 is 12121001202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259098820 + ... + 259106619.

Almost surely, 2^{2021001212100} is an apocalyptic number.

2021001212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021001212100 is an abundant number, since it is smaller than the sum of its proper divisors (4276231294780).

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

2021001212100 is a wasteful number, since it uses less digits than its factorization.

2021001212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518205469 (or 518205462 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 2021001212100 its reverse (12121001202), we get a palindrome (2033122213302).

The spelling of 2021001212100 in words is "two trillion, twenty-one billion, one million, two hundred twelve thousand, one hundred".