222001221021021 has 16 divisors (see below), whose sum is σ = 354189982256320. Its totient is φ = 136616136012720.

The previous prime is 222001221021011. The next prime is 222001221021029. The reversal of 222001221021021 is 120120122100222.

It is a happy number.

222001221021021 is a `hidden beast` number, since 2 + 220 + 0 + 1 + 2 + 210 + 210 + 21 = 666.

It is not a de Polignac number, because 222001221021021 - 2⁷ = 222001221020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222001221020985 and 222001221021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001221021029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316241055235 + ... + 316241055936.

It is an arithmetic number, because the mean of its divisors is an integer number (22136873891020).

Almost surely, 2^{222001221021021} is an apocalyptic number.

It is an amenable number.

222001221021021 is a deficient number, since it is larger than the sum of its proper divisors (132188761235299).

222001221021021 is a wasteful number, since it uses less digits than its factorization.

222001221021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632482111193 (or 632482111187 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 222001221021021 its reverse (120120122100222), we get a palindrome (342121343121243).

The spelling of 222001221021021 in words is "two hundred twenty-two trillion, one billion, two hundred twenty-one million, twenty-one thousand, twenty-one".