20210110521321 has 12 divisors (see below), whose sum is σ = 31346293870032. Its totient is φ = 11548634583528.

The previous prime is 20210110521301. The next prime is 20210110521329. The reversal of 20210110521321 is 12312501101202.

It is not a de Polignac number, because 20210110521321 - 2¹⁰ = 20210110520297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20210110521329) 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 11 ways as a sum of consecutive naturals, for example, 68741872375 + ... + 68741872668.

It is an arithmetic number, because the mean of its divisors is an integer number (2612191155836).

Almost surely, 2^{20210110521321} is an apocalyptic number.

20210110521321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20210110521321 is a deficient number, since it is larger than the sum of its proper divisors (11136183348711).

20210110521321 is a wasteful number, since it uses less digits than its factorization.

20210110521321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137483745060 (or 137483745053 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 20210110521321 its reverse (12312501101202), we get a palindrome (32522611622523).

The spelling of 20210110521321 in words is "twenty trillion, two hundred ten billion, one hundred ten million, five hundred twenty-one thousand, three hundred twenty-one".