20010021192 has 64 divisors (see below), whose sum is σ = 63523881600. Its totient is φ = 5717148480.

The previous prime is 20010021169. The next prime is 20010021197. The reversal of 20010021192 is 29112001002.

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 (20010021197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6615559 + ... + 6618582.

It is an arithmetic number, because the mean of its divisors is an integer number (992560650).

Almost surely, 2^20010021192 is an apocalyptic number.

It is an amenable number.

20010021192 is an abundant number, since it is smaller than the sum of its proper divisors (43513860408).

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

20010021192 is a wasteful number, since it uses less digits than its factorization.

20010021192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13234163 (or 13234153 counting only the distinct ones).

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

Adding to 20010021192 its reverse (29112001002), we get a palindrome (49122022194).

The spelling of 20010021192 in words is "twenty billion, ten million, twenty-one thousand, one hundred ninety-two".