21122002222121 has 4 divisors (see below), whose sum is σ = 21803357132544. Its totient is φ = 20440647311700.

The previous prime is 21122002222073. The next prime is 21122002222207. The reversal of 21122002222121 is 12122220022112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21122002222121 - 2²² = 21121998027817 is a prime.

It is a super-2 number, since 2×21122002222121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122002222093 and 21122002222102.

It is not an unprimeable number, because it can be changed into a prime (21122002222021) 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 3 ways as a sum of consecutive naturals, for example, 340677455165 + ... + 340677455226.

It is an arithmetic number, because the mean of its divisors is an integer number (5450839283136).

Almost surely, 2^{21122002222121} is an apocalyptic number.

It is an amenable number.

21122002222121 is a deficient number, since it is larger than the sum of its proper divisors (681354910423).

21122002222121 is an equidigital number, since it uses as much as digits as its factorization.

21122002222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681354910422.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21122002222121 its reverse (12122220022112), we get a palindrome (33244222244233).

The spelling of 21122002222121 in words is "twenty-one trillion, one hundred twenty-two billion, two million, two hundred twenty-two thousand, one hundred twenty-one".