20023233021 has 16 divisors (see below), whose sum is σ = 32360781120. Its totient is φ = 12135292560.

The previous prime is 20023233007. The next prime is 20023233031. The reversal of 20023233021 is 12033232002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20023233021 is a prime.

It is a super-2 number, since 2×20023233021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20023232985 and 20023233003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023233031) 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, 33708850 + ... + 33709443.

It is an arithmetic number, because the mean of its divisors is an integer number (2022548820).

Almost surely, 2^20023233021 is an apocalyptic number.

It is an amenable number.

20023233021 is a deficient number, since it is larger than the sum of its proper divisors (12337548099).

20023233021 is a wasteful number, since it uses less digits than its factorization.

20023233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67418313 (or 67418307 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20023233021 its reverse (12033232002), we get a palindrome (32056465023).

The spelling of 20023233021 in words is "twenty billion, twenty-three million, two hundred thirty-three thousand, twenty-one".