2021222121 has 8 divisors (see below), whose sum is σ = 2698672704. Its totient is φ = 1345626480.

The previous prime is 2021222111. The next prime is 2021222149. The reversal of 2021222121 is 1212221202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2021222121 - 2⁶ = 2021222057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021222121.

It is not an unprimeable number, because it can be changed into a prime (2021222111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461190 + ... + 465551.

It is an arithmetic number, because the mean of its divisors is an integer number (337334088).

Almost surely, 2^2021222121 is an apocalyptic number.

It is an amenable number.

2021222121 is a deficient number, since it is larger than the sum of its proper divisors (677450583).

2021222121 is an equidigital number, since it uses as much as digits as its factorization.

2021222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927471.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2021222121 is about 44958.0039703722. The cubic root of 2021222121 is about 1264.3617460666.

Adding to 2021222121 its reverse (1212221202), we get a palindrome (3233443323).

The spelling of 2021222121 in words is "two billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".