21021120212122 has 8 divisors (see below), whose sum is σ = 33386485042836. Its totient is φ = 9892291864512.

The previous prime is 21021120212063. The next prime is 21021120212137. The reversal of 21021120212122 is 22121202112012.

It can be written as a sum of positive squares in 2 ways, for example, as 19441124005681 + 1579996206441 = 4409209^2 + 1256979^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21021120212122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309134120733 + ... + 309134120800.

Almost surely, 2^{21021120212122} is an apocalyptic number.

21021120212122 is a deficient number, since it is larger than the sum of its proper divisors (12365364830714).

21021120212122 is a wasteful number, since it uses less digits than its factorization.

21021120212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618268241552.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021120212122 its reverse (22121202112012), we get a palindrome (43142322324134).

The spelling of 21021120212122 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred twelve thousand, one hundred twenty-two".