21011021022122 has 8 divisors (see below), whose sum is σ = 33370445152836. Its totient is φ = 9887539304512.

The previous prime is 21011021022097. The next prime is 21011021022161. The reversal of 21011021022122 is 22122012011012.

It can be written as a sum of positive squares in 2 ways, for example, as 20487581795041 + 523439227081 = 4526321^2 + 723491^2 .

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

It is a super-2 number, since 2×21011021022122² (a number of 27 digits) contains 22 as substring.

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 21011021022122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308985603233 + ... + 308985603300.

Almost surely, 2^{21011021022122} is an apocalyptic number.

21011021022122 is a deficient number, since it is larger than the sum of its proper divisors (12359424130714).

21011021022122 is a wasteful number, since it uses less digits than its factorization.

21011021022122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617971206552.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21011021022122 its reverse (22122012011012), we get a palindrome (43133033033134).

The spelling of 21011021022122 in words is "twenty-one trillion, eleven billion, twenty-one million, twenty-two thousand, one hundred twenty-two".