21013123222 has 64 divisors (see below), whose sum is σ = 39401607168. Its totient is φ = 8182944000.

The previous prime is 21013123217. The next prime is 21013123237. The reversal of 21013123222 is 22232131012.

It is a super-2 number, since 2×21013123222² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21013123222.

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 31 ways as a sum of consecutive naturals, for example, 15906322 + ... + 15907642.

It is an arithmetic number, because the mean of its divisors is an integer number (615650112).

Almost surely, 2^21013123222 is an apocalyptic number.

21013123222 is a deficient number, since it is larger than the sum of its proper divisors (18388483946).

21013123222 is a wasteful number, since it uses less digits than its factorization.

21013123222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21013123222 its reverse (22232131012), we get a palindrome (43245254234).

The spelling of 21013123222 in words is "twenty-one billion, thirteen million, one hundred twenty-three thousand, two hundred twenty-two".