21001011121222 has 96 divisors (see below), whose sum is σ = 36914384314080. Its totient is φ = 8922705792000.

The previous prime is 21001011121217. The next prime is 21001011121289. The reversal of 21001011121222 is 22212111010012.

It is a super-3 number, since 3×21001011121222³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21001011121196 and 21001011121205.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 1510748472 + ... + 1510762372.

It is an arithmetic number, because the mean of its divisors is an integer number (384524836605).

Almost surely, 2^{21001011121222} is an apocalyptic number.

21001011121222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001011121222 is a deficient number, since it is larger than the sum of its proper divisors (15913373192858).

21001011121222 is a wasteful number, since it uses less digits than its factorization.

21001011121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16438 (or 16427 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21001011121222 its reverse (22212111010012), we get a palindrome (43213122131234).

The spelling of 21001011121222 in words is "twenty-one trillion, one billion, eleven million, one hundred twenty-one thousand, two hundred twenty-two".