21210222221121 has 32 divisors (see below), whose sum is σ = 28612508576256. Its totient is φ = 13974944256000.

The previous prime is 21210222221119. The next prime is 21210222221143. The reversal of 21210222221121 is 12112222201212.

It is not a de Polignac number, because 21210222221121 - 2¹ = 21210222221119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210222221161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 627300306 + ... + 627334116.

It is an arithmetic number, because the mean of its divisors is an integer number (894140893008).

Almost surely, 2^{21210222221121} is an apocalyptic number.

It is an amenable number.

21210222221121 is a deficient number, since it is larger than the sum of its proper divisors (7402286355135).

21210222221121 is a wasteful number, since it uses less digits than its factorization.

21210222221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40413.

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

Adding to 21210222221121 its reverse (12112222201212), we get a palindrome (33322444422333).

The spelling of 21210222221121 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".