212121121101021 has 48 divisors (see below), whose sum is σ = 334898147151360. Its totient is φ = 128309685228960.

The previous prime is 212121121101013. The next prime is 212121121101101. The reversal of 212121121101021 is 120101121121212.

It is a happy number.

212121121101021 is a `hidden beast` number, since 212 + 1 + 211 + 211 + 0 + 10 + 21 = 666.

It is not a de Polignac number, because 212121121101021 - 2³ = 212121121101013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212121121100985 and 212121121101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121121101011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164550646 + ... + 165834728.

It is an arithmetic number, because the mean of its divisors is an integer number (6977044732320).

Almost surely, 2^{212121121101021} is an apocalyptic number.

It is an amenable number.

212121121101021 is a deficient number, since it is larger than the sum of its proper divisors (122777026050339).

212121121101021 is a wasteful number, since it uses less digits than its factorization.

212121121101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287326 (or 1287323 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212121121101021 its reverse (120101121121212), we get a palindrome (332222242222233).

It can be divided in two parts, 2121211 and 21101021, that added together give a palindrome (23222232).

The spelling of 212121121101021 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, twenty-one".