20100021192 has 96 divisors (see below), whose sum is σ = 56617142400. Its totient is φ = 6436340352.

The previous prime is 20100021181. The next prime is 20100021197. The reversal of 20100021192 is 29112000102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20100021197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 162703 + ... + 258209.

It is an arithmetic number, because the mean of its divisors is an integer number (589761900).

Almost surely, 2^20100021192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20100021192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28308571200).

20100021192 is an abundant number, since it is smaller than the sum of its proper divisors (36517121208).

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

20100021192 is a wasteful number, since it uses less digits than its factorization.

20100021192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95635 (or 95628 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 20100021192 its reverse (29112000102), we get a palindrome (49212021294).

The spelling of 20100021192 in words is "twenty billion, one hundred million, twenty-one thousand, one hundred ninety-two".