22121010012221 has 4 divisors (see below), whose sum is σ = 22170944572512. Its totient is φ = 22071075451932.

The previous prime is 22121010012209. The next prime is 22121010012223. The reversal of 22121010012221 is 12221001012122.

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 a de Polignac number, because none of the positive numbers 2^k-22121010012221 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 22121010012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121010012223) 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, 24967279481 + ... + 24967280366.

It is an arithmetic number, because the mean of its divisors is an integer number (5542736143128).

Almost surely, 2^{22121010012221} is an apocalyptic number.

It is an amenable number.

22121010012221 is a deficient number, since it is larger than the sum of its proper divisors (49934560291).

22121010012221 is an equidigital number, since it uses as much as digits as its factorization.

22121010012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49934560290.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22121010012221 its reverse (12221001012122), we get a palindrome (34342011024343).

Subtracting from 22121010012221 its reverse (12221001012122), we obtain a palindrome (9900009000099).

The spelling of 22121010012221 in words is "twenty-two trillion, one hundred twenty-one billion, ten million, twelve thousand, two hundred twenty-one".