22000222121 has 8 divisors (see below), whose sum is σ = 24097606920. Its totient is φ = 19992087808.

The previous prime is 22000222117. The next prime is 22000222129. The reversal of 22000222121 is 12122200022.

It can be written as a sum of positive squares in 4 ways, for example, as 6453872896 + 15546349225 = 80336^2 + 124685^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22000222121 - 2² = 22000222117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22000222096 and 22000222105.

It is not an unprimeable number, because it can be changed into a prime (22000222129) 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, 22312106 + ... + 22313091.

It is an arithmetic number, because the mean of its divisors is an integer number (3012200865).

Almost surely, 2^22000222121 is an apocalyptic number.

It is an amenable number.

22000222121 is a deficient number, since it is larger than the sum of its proper divisors (2097384799).

22000222121 is a wasteful number, since it uses less digits than its factorization.

22000222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44625243.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22000222121 its reverse (12122200022), we get a palindrome (34122422143).

The spelling of 22000222121 in words is "twenty-two billion, two hundred twenty-two thousand, one hundred twenty-one".