22221201022121 has 4 divisors (see below), whose sum is σ = 22221264554832. Its totient is φ = 22221137489412.

The previous prime is 22221201022087. The next prime is 22221201022127. The reversal of 22221201022121 is 12122010212222.

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 22221201022121 - 2³⁸ = 21946323115177 is a prime.

It is a super-2 number, since 2×22221201022121² (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 = 22221201022093 and 22221201022102.

It is not an unprimeable number, because it can be changed into a prime (22221201022127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31238795 + ... + 31942208.

It is an arithmetic number, because the mean of its divisors is an integer number (5555316138708).

Almost surely, 2^{22221201022121} is an apocalyptic number.

It is an amenable number.

22221201022121 is a deficient number, since it is larger than the sum of its proper divisors (63532711).

22221201022121 is an equidigital number, since it uses as much as digits as its factorization.

22221201022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63532710.

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

Adding to 22221201022121 its reverse (12122010212222), we get a palindrome (34343211234343).

The spelling of 22221201022121 in words is "twenty-two trillion, two hundred twenty-one billion, two hundred one million, twenty-two thousand, one hundred twenty-one".