22000022122221 has 48 divisors (see below), whose sum is σ = 38201588897472. Its totient is φ = 12021478963200.

The previous prime is 22000022122207. The next prime is 22000022122223. The reversal of 22000022122221 is 12222122000022.

22000022122221 is a `hidden beast` number, since 2 + 200 + 0 + 0 + 221 + 22 + 221 = 666.

It is not a de Polignac number, because 22000022122221 - 2⁶ = 22000022122157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22000022122194 and 22000022122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000022122223) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198712500 + ... + 198823181.

It is an arithmetic number, because the mean of its divisors is an integer number (795866435364).

Almost surely, 2^{22000022122221} is an apocalyptic number.

It is an amenable number.

22000022122221 is a deficient number, since it is larger than the sum of its proper divisors (16201566775251).

22000022122221 is a wasteful number, since it uses less digits than its factorization.

22000022122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397535754 (or 397535751 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22000022122221 its reverse (12222122000022), we get a palindrome (34222144122243).

It can be divided in two parts, 22000022 and 122221, that multiplied together give a palindrome (2688864688862).

The spelling of 22000022122221 in words is "twenty-two trillion, twenty-two million, one hundred twenty-two thousand, two hundred twenty-one".