221221120207 has 12 divisors (see below), whose sum is σ = 247211094096. Its totient is φ = 197249785920.

The previous prime is 221221120199. The next prime is 221221120217. The reversal of 221221120207 is 702021122122.

It is not a de Polignac number, because 221221120207 - 2³ = 221221120199 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 (221221120217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18017419 + ... + 18029692.

It is an arithmetic number, because the mean of its divisors is an integer number (20600924508).

Almost surely, 2^221221120207 is an apocalyptic number.

221221120207 is a deficient number, since it is larger than the sum of its proper divisors (25989973889).

221221120207 is a wasteful number, since it uses less digits than its factorization.

221221120207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36047166 (or 36047147 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 221221120207 its reverse (702021122122), we get a palindrome (923242242329).

The spelling of 221221120207 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, two hundred seven".