2021222212121 has 16 divisors (see below), whose sum is σ = 2333907663360. Its totient is φ = 1714523535360.

The previous prime is 2021222212117. The next prime is 2021222212159. The reversal of 2021222212121 is 1212122221202.

It is a cyclic number.

It is not a de Polignac number, because 2021222212121 - 2² = 2021222212117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021222212093 and 2021222212102.

It is not an unprimeable number, because it can be changed into a prime (2021222212171) 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, 14543600 + ... + 14681918.

It is an arithmetic number, because the mean of its divisors is an integer number (145869228960).

Almost surely, 2^{2021222212121} is an apocalyptic number.

It is an amenable number.

2021222212121 is a deficient number, since it is larger than the sum of its proper divisors (312685451239).

2021222212121 is a wasteful number, since it uses less digits than its factorization.

2021222212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159944.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2021222212121 its reverse (1212122221202), we get a palindrome (3233344433323).

The spelling of 2021222212121 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".