222020021221 has 4 divisors (see below), whose sum is σ = 222066405792. Its totient is φ = 221973636652.

The previous prime is 222020021207. The next prime is 222020021227. The reversal of 222020021221 is 122120020222.

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 222020021221 - 2²⁵ = 221986466789 is a prime.

It is a super-3 number, since 3×222020021221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222020021195 and 222020021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222020021227) 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, 23185105 + ... + 23194678.

It is an arithmetic number, because the mean of its divisors is an integer number (55516601448).

Almost surely, 2^222020021221 is an apocalyptic number.

It is an amenable number.

222020021221 is a deficient number, since it is larger than the sum of its proper divisors (46384571).

222020021221 is an equidigital number, since it uses as much as digits as its factorization.

222020021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46384570.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222020021221 its reverse (122120020222), we get a palindrome (344140041443).

Subtracting from 222020021221 its reverse (122120020222), we obtain a palindrome (99900000999).

The spelling of 222020021221 in words is "two hundred twenty-two billion, twenty million, twenty-one thousand, two hundred twenty-one".