20021103172 has 24 divisors (see below), whose sum is σ = 41422973760. Its totient is φ = 8284594080.

The previous prime is 20021103169. The next prime is 20021103173. The reversal of 20021103172 is 27130112002.

It is a super-3 number, since 3×20021103172³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20021103173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12327454 + ... + 12329077.

It is an arithmetic number, because the mean of its divisors is an integer number (1725957240).

Almost surely, 2^20021103172 is an apocalyptic number.

It is an amenable number.

20021103172 is an abundant number, since it is smaller than the sum of its proper divisors (21401870588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021103172 is a wasteful number, since it uses less digits than its factorization.

20021103172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24656571 (or 24656569 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 20021103172 its reverse (27130112002), we get a palindrome (47151215174).

The spelling of 20021103172 in words is "twenty billion, twenty-one million, one hundred three thousand, one hundred seventy-two".