212021221112211 has 64 divisors (see below), whose sum is σ = 345094443938816. Its totient is φ = 113251589337600.

The previous prime is 212021221112167. The next prime is 212021221112213. The reversal of 212021221112211 is 112211122120212.

It is not a de Polignac number, because 212021221112211 - 2⁷ = 212021221112083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021221112213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49977100 + ... + 54053241.

It is an arithmetic number, because the mean of its divisors is an integer number (5392100686544).

Almost surely, 2^{212021221112211} is an apocalyptic number.

212021221112211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

212021221112211 is a deficient number, since it is larger than the sum of its proper divisors (133073222826605).

212021221112211 is a wasteful number, since it uses less digits than its factorization.

212021221112211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104030492.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212021221112211 its reverse (112211122120212), we get a palindrome (324232343232423).

The spelling of 212021221112211 in words is "two hundred twelve trillion, twenty-one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred eleven".