221222213421 has 16 divisors (see below), whose sum is σ = 323908750848. Its totient is φ = 133186158000.

The previous prime is 221222213351. The next prime is 221222213489. The reversal of 221222213421 is 124312222122.

It is not a de Polignac number, because 221222213421 - 2¹³ = 221222205229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221222213391 and 221222213400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222213521) 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, 22192711 + ... + 22202676.

It is an arithmetic number, because the mean of its divisors is an integer number (20244296928).

Almost surely, 2^221222213421 is an apocalyptic number.

It is an amenable number.

221222213421 is a deficient number, since it is larger than the sum of its proper divisors (102686537427).

221222213421 is a wasteful number, since it uses less digits than its factorization.

221222213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44395552.

The product of its digits is 1536, while the sum is 24.

Adding to 221222213421 its reverse (124312222122), we get a palindrome (345534435543).

The spelling of 221222213421 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred thirteen thousand, four hundred twenty-one".