21011212322 has 16 divisors (see below), whose sum is σ = 33374076192. Its totient is φ = 9886643520.

The previous prime is 21011212297. The next prime is 21011212331. The reversal of 21011212322 is 22321211012.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21011212322.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404273 + ... + 453275.

It is an arithmetic number, because the mean of its divisors is an integer number (2085879762).

Almost surely, 2^21011212322 is an apocalyptic number.

21011212322 is a deficient number, since it is larger than the sum of its proper divisors (12362863870).

21011212322 is a wasteful number, since it uses less digits than its factorization.

21011212322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61633.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21011212322 its reverse (22321211012), we get a palindrome (43332423334).

The spelling of 21011212322 in words is "twenty-one billion, eleven million, two hundred twelve thousand, three hundred twenty-two".