20123101133021 has 4 divisors (see below), whose sum is σ = 20197908200700. Its totient is φ = 20048294065344.

The previous prime is 20123101133017. The next prime is 20123101133027. The reversal of 20123101133021 is 12033110132102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11356320367396 + 8766780765625 = 3369914^2 + 2960875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123101133021 - 2² = 20123101133017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123101132984 and 20123101133002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123101133027) 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 3 ways as a sum of consecutive naturals, for example, 37403533436 + ... + 37403533973.

It is an arithmetic number, because the mean of its divisors is an integer number (5049477050175).

Almost surely, 2^{20123101133021} is an apocalyptic number.

It is an amenable number.

20123101133021 is a deficient number, since it is larger than the sum of its proper divisors (74807067679).

20123101133021 is an equidigital number, since it uses as much as digits as its factorization.

20123101133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74807067678.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 20123101133021 its reverse (12033110132102), we get a palindrome (32156211265123).

The spelling of 20123101133021 in words is "twenty trillion, one hundred twenty-three billion, one hundred one million, one hundred thirty-three thousand, twenty-one".