21120021021192 has 32 divisors (see below), whose sum is σ = 53796279962880. Its totient is φ = 6907176685760.

The previous prime is 21120021021191. The next prime is 21120021021217. The reversal of 21120021021192 is 29112012002112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21120021021191) 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 7 ways as a sum of consecutive naturals, for example, 8301893784 + ... + 8301896327.

It is an arithmetic number, because the mean of its divisors is an integer number (1681133748840).

Almost surely, 2^{21120021021192} is an apocalyptic number.

It is an amenable number.

21120021021192 is an abundant number, since it is smaller than the sum of its proper divisors (32676258941688).

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

21120021021192 is a wasteful number, since it uses less digits than its factorization.

21120021021192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16603790173 (or 16603790169 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 21120021021192 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, twenty-one thousand, one hundred ninety-two".