212021121112021 has 8 divisors (see below), whose sum is σ = 228333927714200. Its totient is φ = 195708813023232.

The previous prime is 212021121111967. The next prime is 212021121112093. The reversal of 212021121112021 is 120211121120212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37472896923121 + 174548224188900 = 6121511^2 + 13211670^2 .

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 212021121112021 - 2³³ = 212012531177429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212021121112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021151112021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123744780 + ... + 125446453.

It is an arithmetic number, because the mean of its divisors is an integer number (28541740964275).

Almost surely, 2^{212021121112021} is an apocalyptic number.

It is an amenable number.

212021121112021 is a deficient number, since it is larger than the sum of its proper divisors (16312806602179).

212021121112021 is a wasteful number, since it uses less digits than its factorization.

212021121112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249256695.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212021121112021 its reverse (120211121120212), we get a palindrome (332232242232233).

The spelling of 212021121112021 in words is "two hundred twelve trillion, twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, twenty-one".