21222111670 has 64 divisors (see below), whose sum is σ = 41275054656. Its totient is φ = 7826964480.

The previous prime is 21222111667. The next prime is 21222111679. The reversal of 21222111670 is 7611122212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222111679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2661109 + ... + 2669071.

It is an arithmetic number, because the mean of its divisors is an integer number (644922729).

Almost surely, 2^21222111670 is an apocalyptic number.

21222111670 is a deficient number, since it is larger than the sum of its proper divisors (20052942986).

21222111670 is a wasteful number, since it uses less digits than its factorization.

21222111670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8305.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 21222111670 its reverse (7611122212), we get a palindrome (28833233882).

The spelling of 21222111670 in words is "twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, six hundred seventy".