21667211170 has 32 divisors (see below), whose sum is σ = 42557711040. Its totient is φ = 7876914240.

The previous prime is 21667211147. The next prime is 21667211191. The reversal of 21667211170 is 7111276612.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 430801 + ... + 478459.

It is an arithmetic number, because the mean of its divisors is an integer number (1329928470).

Almost surely, 2^21667211170 is an apocalyptic number.

21667211170 is a deficient number, since it is larger than the sum of its proper divisors (20890499870).

21667211170 is a wasteful number, since it uses less digits than its factorization.

21667211170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51810.

The product of its (nonzero) digits is 7056, while the sum is 34.

Adding to 21667211170 its reverse (7111276612), we get a palindrome (28778487782).

The spelling of 21667211170 in words is "twenty-one billion, six hundred sixty-seven million, two hundred eleven thousand, one hundred seventy".