1800212212021 has 8 divisors (see below), whose sum is σ = 1895870865600. Its totient is φ = 1704644622720.

The previous prime is 1800212211991. The next prime is 1800212212037. The reversal of 1800212212021 is 1202122120081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1800212212021 - 2¹⁵ = 1800212179253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1800212211983 and 1800212212001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1800212212081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22725481 + ... + 22804558.

It is an arithmetic number, because the mean of its divisors is an integer number (236983858200).

Almost surely, 2^{1800212212021} is an apocalyptic number.

It is an amenable number.

1800212212021 is a deficient number, since it is larger than the sum of its proper divisors (95658653579).

1800212212021 is a wasteful number, since it uses less digits than its factorization.

1800212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45532139.

The product of its (nonzero) digits is 256, while the sum is 22.

The spelling of 1800212212021 in words is "one trillion, eight hundred billion, two hundred twelve million, two hundred twelve thousand, twenty-one".