21112427170 has 32 divisors (see below), whose sum is σ = 39333729600. Its totient is φ = 8149423296.

The previous prime is 21112427137. The next prime is 21112427261. The reversal of 21112427170 is 7172421112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555517 + ... + 592303.

It is an arithmetic number, because the mean of its divisors is an integer number (1229179050).

Almost surely, 2^21112427170 is an apocalyptic number.

21112427170 is a deficient number, since it is larger than the sum of its proper divisors (18221302430).

21112427170 is a wasteful number, since it uses less digits than its factorization.

21112427170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38802.

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

Adding to 21112427170 its reverse (7172421112), we get a palindrome (28284848282).

The spelling of 21112427170 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-seven thousand, one hundred seventy".