212210222221221 has 32 divisors (see below), whose sum is σ = 326952471729408. Its totient is φ = 119921606438400.

The previous prime is 212210222221211. The next prime is 212210222221237. The reversal of 212210222221221 is 122122222012212.

It is a happy number.

It is not a de Polignac number, because 212210222221221 - 2⁶ = 212210222221157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210222221191 and 212210222221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210222221211) 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, 56837896 + ... + 60456321.

It is an arithmetic number, because the mean of its divisors is an integer number (10217264741544).

Almost surely, 2^{212210222221221} is an apocalyptic number.

212210222221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212210222221221 is a deficient number, since it is larger than the sum of its proper divisors (114742249508187).

212210222221221 is a wasteful number, since it uses less digits than its factorization.

212210222221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117295181.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 212210222221221 its reverse (122122222012212), we get a palindrome (334332444233433).

The spelling of 212210222221221 in words is "two hundred twelve trillion, two hundred ten billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".