21012936189922 has 8 divisors (see below), whose sum is σ = 31521127747500. Its totient is φ = 10505893607424.

The previous prime is 21012936189859. The next prime is 21012936189929. The reversal of 21012936189922 is 22998163921012.

It can be written as a sum of positive squares in 2 ways, for example, as 11803890191041 + 9209045998881 = 3435679^2 + 3034641^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21012936189929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287198047 + ... + 287271202.

Almost surely, 2^{21012936189922} is an apocalyptic number.

21012936189922 is a deficient number, since it is larger than the sum of its proper divisors (10508191557578).

21012936189922 is a wasteful number, since it uses less digits than its factorization.

21012936189922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574487540.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 21012936189922 in words is "twenty-one trillion, twelve billion, nine hundred thirty-six million, one hundred eighty-nine thousand, nine hundred twenty-two".