20211222011121 has 12 divisors (see below), whose sum is σ = 29483036730420. Its totient is φ = 13340740600800.

The previous prime is 20211222011117. The next prime is 20211222011129. The reversal of 20211222011121 is 12111022211202.

20211222011121 is a `hidden beast` number, since 202 + 112 + 220 + 11 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13880281640625 + 6330940370496 = 3725625^2 + 2516136^2 .

It is not a de Polignac number, because 20211222011121 - 2² = 20211222011117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211222011094 and 20211222011103.

It is not an unprimeable number, because it can be changed into a prime (20211222011129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11117282926 + ... + 11117284743.

It is an arithmetic number, because the mean of its divisors is an integer number (2456919727535).

Almost surely, 2^{20211222011121} is an apocalyptic number.

It is an amenable number.

20211222011121 is a deficient number, since it is larger than the sum of its proper divisors (9271814719299).

20211222011121 is a wasteful number, since it uses less digits than its factorization.

20211222011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22234567776 (or 22234567773 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20211222011121 its reverse (12111022211202), we get a palindrome (32322244222323).

The spelling of 20211222011121 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-two million, eleven thousand, one hundred twenty-one".