22121202212121 has 16 divisors (see below), whose sum is σ = 30777537576960. Its totient is φ = 14106176359440.

The previous prime is 22121202212113. The next prime is 22121202212147. The reversal of 22121202212121 is 12121220212122.

It is not a de Polignac number, because 22121202212121 - 2³ = 22121202212113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22121202212171) 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, 9704616 + ... + 11765286.

It is an arithmetic number, because the mean of its divisors is an integer number (1923596098560).

Almost surely, 2^{22121202212121} is an apocalyptic number.

It is an amenable number.

22121202212121 is a deficient number, since it is larger than the sum of its proper divisors (8656335364839).

22121202212121 is a wasteful number, since it uses less digits than its factorization.

22121202212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216276.

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

Adding to 22121202212121 its reverse (12121220212122), we get a palindrome (34242422424243).

The spelling of 22121202212121 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred two million, two hundred twelve thousand, one hundred twenty-one".