21222112102021 has 8 divisors (see below), whose sum is σ = 22948566779520. Its totient is φ = 19548779107008.

The previous prime is 21222112102001. The next prime is 21222112102133. The reversal of 21222112102021 is 12020121122212.

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

It is a cyclic number.

It is not a de Polignac number, because 21222112102021 - 2⁵ = 21222112101989 is a prime.

It is a super-2 number, since 2×21222112102021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222112102021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222112102001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13280419791 + ... + 13280421388.

It is an arithmetic number, because the mean of its divisors is an integer number (2868570847440).

Almost surely, 2^{21222112102021} is an apocalyptic number.

It is an amenable number.

21222112102021 is a deficient number, since it is larger than the sum of its proper divisors (1726454677499).

21222112102021 is a wasteful number, since it uses less digits than its factorization.

21222112102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26560841243.

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

Adding to 21222112102021 its reverse (12020121122212), we get a palindrome (33242233224233).

The spelling of 21222112102021 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, one hundred two thousand, twenty-one".