212121220202101 has 32 divisors (see below), whose sum is σ = 263173968527360. Its totient is φ = 166918275308736.

The previous prime is 212121220202077. The next prime is 212121220202107. The reversal of 212121220202101 is 101202022121212.

It is not a de Polignac number, because 212121220202101 - 2¹⁷ = 212121220071029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121220202107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145299726 + ... + 146752351.

It is an arithmetic number, because the mean of its divisors is an integer number (8224186516480).

Almost surely, 2^{212121220202101} is an apocalyptic number.

It is an amenable number.

212121220202101 is a deficient number, since it is larger than the sum of its proper divisors (51052748325259).

212121220202101 is a wasteful number, since it uses less digits than its factorization.

212121220202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292052273.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212121220202101 its reverse (101202022121212), we get a palindrome (313323242323313).

The spelling of 212121220202101 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred one".