22220221021221 has 16 divisors (see below), whose sum is σ = 29666125454400. Its totient is φ = 14793907539840.

The previous prime is 22220221021181. The next prime is 22220221021321. The reversal of 22220221021221 is 12212012202222.

It is not a de Polignac number, because 22220221021221 - 2²¹ = 22220218924069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220221021321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8889355 + ... + 11111303.

It is an arithmetic number, because the mean of its divisors is an integer number (1854132840900).

Almost surely, 2^{22220221021221} is an apocalyptic number.

It is an amenable number.

22220221021221 is a deficient number, since it is larger than the sum of its proper divisors (7445904433179).

22220221021221 is a wasteful number, since it uses less digits than its factorization.

22220221021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226356.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22220221021221 its reverse (12212012202222), we get a palindrome (34432233223443).

The spelling of 22220221021221 in words is "twenty-two trillion, two hundred twenty billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".