22021212212121 has 16 divisors (see below), whose sum is σ = 31660792914240. Its totient is φ = 13568911246080.

The previous prime is 22021212212093. The next prime is 22021212212141. The reversal of 22021212212121 is 12121221212022.

It is not a de Polignac number, because 22021212212121 - 2¹⁵ = 22021212179353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22021212212141) 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, 4711425180 + ... + 4711429853.

It is an arithmetic number, because the mean of its divisors is an integer number (1978799557140).

Almost surely, 2^{22021212212121} is an apocalyptic number.

It is an amenable number.

22021212212121 is a deficient number, since it is larger than the sum of its proper divisors (9639580702119).

22021212212121 is a wasteful number, since it uses less digits than its factorization.

22021212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9422855096.

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

Adding to 22021212212121 its reverse (12121221212022), we get a palindrome (34142433424143).

The spelling of 22021212212121 in words is "twenty-two trillion, twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".