20123033311021 has 4 divisors (see below), whose sum is σ = 20133928295712. Its totient is φ = 20112138326332.

The previous prime is 20123033311019. The next prime is 20123033311037. The reversal of 20123033311021 is 12011333032102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20123033311021 - 2¹ = 20123033311019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123033310983 and 20123033311001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123033311321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5447489575 + ... + 5447493268.

It is an arithmetic number, because the mean of its divisors is an integer number (5033482073928).

Almost surely, 2^{20123033311021} is an apocalyptic number.

It is an amenable number.

20123033311021 is a deficient number, since it is larger than the sum of its proper divisors (10894984691).

20123033311021 is a wasteful number, since it uses less digits than its factorization.

20123033311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10894984690.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 20123033311021 its reverse (12011333032102), we get a palindrome (32134366343123).

The spelling of 20123033311021 in words is "twenty trillion, one hundred twenty-three billion, thirty-three million, three hundred eleven thousand, twenty-one".