212111020122221 has 64 divisors (see below), whose sum is σ = 242995376701440. Its totient is φ = 183467336640000.

The previous prime is 212111020122161. The next prime is 212111020122241. The reversal of 212111020122221 is 122221020111212.

It is a cyclic number.

It is not a de Polignac number, because 212111020122221 - 2¹⁴ = 212111020105837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212111020122193 and 212111020122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111020122241) 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, 1624646681 + ... + 1624777233.

It is an arithmetic number, because the mean of its divisors is an integer number (3796802760960).

Almost surely, 2^{212111020122221} is an apocalyptic number.

It is an amenable number.

212111020122221 is a deficient number, since it is larger than the sum of its proper divisors (30884356579219).

212111020122221 is a wasteful number, since it uses less digits than its factorization.

212111020122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131258.

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

Adding to 212111020122221 its reverse (122221020111212), we get a palindrome (334332040233433).

The spelling of 212111020122221 in words is "two hundred twelve trillion, one hundred eleven billion, twenty million, one hundred twenty-two thousand, two hundred twenty-one".