20102112321 has 16 divisors (see below), whose sum is σ = 27564882624. Its totient is φ = 13021366464.

The previous prime is 20102112319. The next prime is 20102112361. The reversal of 20102112321 is 12321120102.

It is not a de Polignac number, because 20102112321 - 2¹ = 20102112319 is a prime.

It is a super-2 number, since 2×20102112321² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20102112321.

It is not an unprimeable number, because it can be changed into a prime (20102112301) 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, 42171 + ... + 204896.

It is an arithmetic number, because the mean of its divisors is an integer number (1722805164).

Almost surely, 2^20102112321 is an apocalyptic number.

It is an amenable number.

20102112321 is a deficient number, since it is larger than the sum of its proper divisors (7462770303).

20102112321 is a wasteful number, since it uses less digits than its factorization.

20102112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247840.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20102112321 its reverse (12321120102), we get a palindrome (32423232423).

The spelling of 20102112321 in words is "twenty billion, one hundred two million, one hundred twelve thousand, three hundred twenty-one".