21142271170 has 32 divisors (see below), whose sum is σ = 40308357888. Its totient is φ = 7956741888.

The previous prime is 21142271167. The next prime is 21142271233. The reversal of 21142271170 is 7117224112.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 522279 + ... + 561301.

It is an arithmetic number, because the mean of its divisors is an integer number (1259636184).

Almost surely, 2^21142271170 is an apocalyptic number.

21142271170 is a deficient number, since it is larger than the sum of its proper divisors (19166086718).

21142271170 is a wasteful number, since it uses less digits than its factorization.

21142271170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42234.

The product of its (nonzero) digits is 1568, while the sum is 28.

Adding to 21142271170 its reverse (7117224112), we get a palindrome (28259495282).

The spelling of 21142271170 in words is "twenty-one billion, one hundred forty-two million, two hundred seventy-one thousand, one hundred seventy".