22021212121021 has 8 divisors (see below), whose sum is σ = 22313476642464. Its totient is φ = 21729589235760.

The previous prime is 22021212120983. The next prime is 22021212121067. The reversal of 22021212121021 is 12012121212022.

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 22021212121021 - 2¹¹ = 22021212118973 is a prime.

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 22021212121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021212121081) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 160339950 + ... + 160477231.

It is an arithmetic number, because the mean of its divisors is an integer number (2789184580308).

Almost surely, 2^{22021212121021} is an apocalyptic number.

It is an amenable number.

22021212121021 is a deficient number, since it is larger than the sum of its proper divisors (292264521443).

22021212121021 is an equidigital number, since it uses as much as digits as its factorization.

22021212121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320818091.

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

Adding to 22021212121021 its reverse (12012121212022), we get a palindrome (34033333333043).

The spelling of 22021212121021 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, twenty-one".