12122211222021 has 16 divisors (see below), whose sum is σ = 16886532827520. Its totient is φ = 7720550534400.

The previous prime is 12122211221999. The next prime is 12122211222053. The reversal of 12122211222021 is 12022211222121.

It is not a de Polignac number, because 12122211222021 - 2⁷ = 12122211221893 is a prime.

It is a super-2 number, since 2×12122211222021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122211222071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108525280 + ... + 108636921.

It is an arithmetic number, because the mean of its divisors is an integer number (1055408301720).

Almost surely, 2^{12122211222021} is an apocalyptic number.

It is an amenable number.

12122211222021 is a deficient number, since it is larger than the sum of its proper divisors (4764321605499).

12122211222021 is a wasteful number, since it uses less digits than its factorization.

12122211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217163036.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12122211222021 its reverse (12022211222121), we get a palindrome (24144422444142).

The spelling of 12122211222021 in words is "twelve trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".