212121002111221 has 8 divisors (see below), whose sum is σ = 242424229264704. Its totient is φ = 181817831670720.

The previous prime is 212121002111141. The next prime is 212121002111237. The reversal of 212121002111221 is 122111200121212.

It is a happy number.

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

It is not a de Polignac number, because 212121002111221 - 2¹³ = 212121002103029 is a prime.

It is a super-3 number, since 3×212121002111221³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121002111321) 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, 5836195 + ... + 21408016.

It is an arithmetic number, because the mean of its divisors is an integer number (30303028658088).

Almost surely, 2^{212121002111221} is an apocalyptic number.

It is an amenable number.

212121002111221 is a deficient number, since it is larger than the sum of its proper divisors (30303227153483).

212121002111221 is a wasteful number, since it uses less digits than its factorization.

212121002111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28356491.

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

Adding to 212121002111221 its reverse (122111200121212), we get a palindrome (334232202232433).

The spelling of 212121002111221 in words is "two hundred twelve trillion, one hundred twenty-one billion, two million, one hundred eleven thousand, two hundred twenty-one".