221222210021121 has 16 divisors (see below), whose sum is σ = 315345880197504. Its totient is φ = 137458460592384.

The previous prime is 221222210021117. The next prime is 221222210021161. The reversal of 221222210021121 is 121120012222122.

221222210021121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221222210021121 - 2² = 221222210021117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222210021161) 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, 21056744226 + ... + 21056754731.

It is an arithmetic number, because the mean of its divisors is an integer number (19709117512344).

Almost surely, 2^{221222210021121} is an apocalyptic number.

It is an amenable number.

221222210021121 is a deficient number, since it is larger than the sum of its proper divisors (94123670176383).

221222210021121 is a wasteful number, since it uses less digits than its factorization.

221222210021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42113499080.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221222210021121 its reverse (121120012222122), we get a palindrome (342342222243243).

The spelling of 221222210021121 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty-one thousand, one hundred twenty-one".