21221313110 has 8 divisors (see below), whose sum is σ = 38198363616. Its totient is φ = 8488525240.

The previous prime is 21221313109. The next prime is 21221313133. The reversal of 21221313110 is 1131312212.

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

It is a super-2 number, since 2×21221313110² (a number of 21 digits) contains 22 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 1061065646 + ... + 1061065665.

It is an arithmetic number, because the mean of its divisors is an integer number (4774795452).

Almost surely, 2^21221313110 is an apocalyptic number.

21221313110 is a deficient number, since it is larger than the sum of its proper divisors (16977050506).

21221313110 is a wasteful number, since it uses less digits than its factorization.

21221313110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122131318.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21221313110 its reverse (1131312212), we get a palindrome (22352625322).

The spelling of 21221313110 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, one hundred ten".