20551053021 has 12 divisors (see below), whose sum is σ = 27792795456. Its totient is φ = 13507724440.

The previous prime is 20551052999. The next prime is 20551053037. The reversal of 20551053021 is 12035015502.

It is a happy number.

It is not a de Polignac number, because 20551053021 - 2⁶ = 20551052957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20551052982 and 20551053000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20551053071) 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, 664341 + ... + 694586.

It is an arithmetic number, because the mean of its divisors is an integer number (2316066288).

Almost surely, 2^20551053021 is an apocalyptic number.

It is an amenable number.

20551053021 is a deficient number, since it is larger than the sum of its proper divisors (7241742435).

20551053021 is an equidigital number, since it uses as much as digits as its factorization.

20551053021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359072 (or 1359001 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

Adding to 20551053021 its reverse (12035015502), we get a palindrome (32586068523).

The spelling of 20551053021 in words is "twenty billion, five hundred fifty-one million, fifty-three thousand, twenty-one".