21189167942 has 8 divisors (see below), whose sum is σ = 32098442832. Its totient is φ = 10489687000.

The previous prime is 21189167941. The next prime is 21189167983. The reversal of 21189167942 is 24976198112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21189167941) 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 3 ways as a sum of consecutive naturals, for example, 52448234 + ... + 52448637.

It is an arithmetic number, because the mean of its divisors is an integer number (4012305354).

Almost surely, 2^21189167942 is an apocalyptic number.

21189167942 is a deficient number, since it is larger than the sum of its proper divisors (10909274890).

21189167942 is a wasteful number, since it uses less digits than its factorization.

21189167942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104896974.

The product of its digits is 435456, while the sum is 50.

The spelling of 21189167942 in words is "twenty-one billion, one hundred eighty-nine million, one hundred sixty-seven thousand, nine hundred forty-two".