221212022221 has 8 divisors (see below), whose sum is σ = 225586224864. Its totient is φ = 216878510160.

The previous prime is 221212022201. The next prime is 221212022263. The reversal of 221212022221 is 122220212122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221212022221 - 2⁵ = 221212022189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212022201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10161666 + ... + 10183411.

It is an arithmetic number, because the mean of its divisors is an integer number (28198278108).

Almost surely, 2^221212022221 is an apocalyptic number.

It is an amenable number.

221212022221 is a deficient number, since it is larger than the sum of its proper divisors (4374202643).

221212022221 is a wasteful number, since it uses less digits than its factorization.

221212022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20345291.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221212022221 its reverse (122220212122), we get a palindrome (343432234343).

The spelling of 221212022221 in words is "two hundred twenty-one billion, two hundred twelve million, twenty-two thousand, two hundred twenty-one".