20211231101121 has 12 divisors (see below), whose sum is σ = 29483049990420. Its totient is φ = 13340746600800.

The previous prime is 20211231101111. The next prime is 20211231101129. The reversal of 20211231101121 is 12110113211202.

It is a happy number.

20211231101121 is a `hidden beast` number, since 2 + 0 + 211 + 231 + 101 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15985283385600 + 4225947715521 = 3998160^2 + 2055711^2 .

It is not a de Polignac number, because 20211231101121 - 2³⁷ = 20073792147649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211231101094 and 20211231101103.

It is not an unprimeable number, because it can be changed into a prime (20211231101129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11117287926 + ... + 11117289743.

It is an arithmetic number, because the mean of its divisors is an integer number (2456920832535).

Almost surely, 2^{20211231101121} is an apocalyptic number.

It is an amenable number.

20211231101121 is a deficient number, since it is larger than the sum of its proper divisors (9271818889299).

20211231101121 is a wasteful number, since it uses less digits than its factorization.

20211231101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22234577776 (or 22234577773 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 20211231101121 its reverse (12110113211202), we get a palindrome (32321344312323).

The spelling of 20211231101121 in words is "twenty trillion, two hundred eleven billion, two hundred thirty-one million, one hundred one thousand, one hundred twenty-one".