212121201220121 has 8 divisors (see below), whose sum is σ = 213647812815360. Its totient is φ = 210594597622128.

The previous prime is 212121201220091. The next prime is 212121201220129. The reversal of 212121201220121 is 121022102121212.

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 212121201220121 - 2⁶ = 212121201220057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121201220093 and 212121201220102.

It is not an unprimeable number, because it can be changed into a prime (212121201220129) 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, 57612875 + ... + 61184031.

It is an arithmetic number, because the mean of its divisors is an integer number (26705976601920).

Almost surely, 2^{212121201220121} is an apocalyptic number.

It is an amenable number.

212121201220121 is a deficient number, since it is larger than the sum of its proper divisors (1526611595239).

212121201220121 is a wasteful number, since it uses less digits than its factorization.

212121201220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998623.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212121201220121 its reverse (121022102121212), we get a palindrome (333143303341333).

The spelling of 212121201220121 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred one million, two hundred twenty thousand, one hundred twenty-one".