21000221192 has 32 divisors (see below), whose sum is σ = 39961706400. Its totient is φ = 10344921600.

The previous prime is 21000221189. The next prime is 21000221243. The reversal of 21000221192 is 29112200012.

It is a happy number.

It is a super-2 number, since 2×21000221192² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73592 + ... + 217752.

It is an arithmetic number, because the mean of its divisors is an integer number (1248803325).

Almost surely, 2^21000221192 is an apocalyptic number.

It is an amenable number.

21000221192 is a deficient number, since it is larger than the sum of its proper divisors (18961485208).

21000221192 is a wasteful number, since it uses less digits than its factorization.

21000221192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144437 (or 144433 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 21000221192 in words is "twenty-one billion, two hundred twenty-one thousand, one hundred ninety-two".