212021120200021 has 4 divisors (see below), whose sum is σ = 231295767490944. Its totient is φ = 192746472909100.

The previous prime is 212021120200003. The next prime is 212021120200031. The reversal of 212021120200021 is 120002021120212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 212021120200021 - 2⁹ = 212021120199509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021120199968 and 212021120200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021120200031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9637323645445 + ... + 9637323645466.

It is an arithmetic number, because the mean of its divisors is an integer number (57823941872736).

Almost surely, 2^{212021120200021} is an apocalyptic number.

It is an amenable number.

212021120200021 is a deficient number, since it is larger than the sum of its proper divisors (19274647290923).

212021120200021 is a wasteful number, since it uses less digits than its factorization.

212021120200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19274647290922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212021120200021 its reverse (120002021120212), we get a palindrome (332023141320233).

The spelling of 212021120200021 in words is "two hundred twelve trillion, twenty-one billion, one hundred twenty million, two hundred thousand, twenty-one".