212021111222101 has 4 divisors (see below), whose sum is σ = 212039575146432. Its totient is φ = 212002647297772.

The previous prime is 212021111222071. The next prime is 212021111222111. The reversal of 212021111222101 is 101222111120212.

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 a cyclic number.

It is not a de Polignac number, because 212021111222101 - 2⁹ = 212021111221589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021111222111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9231944941 + ... + 9231967906.

It is an arithmetic number, because the mean of its divisors is an integer number (53009893786608).

Almost surely, 2^{212021111222101} is an apocalyptic number.

It is an amenable number.

212021111222101 is a deficient number, since it is larger than the sum of its proper divisors (18463924331).

212021111222101 is a wasteful number, since it uses less digits than its factorization.

212021111222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18463924330.

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

Adding to 212021111222101 its reverse (101222111120212), we get a palindrome (313243222342313).

The spelling of 212021111222101 in words is "two hundred twelve trillion, twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred one".