222001021021 has 24 divisors (see below), whose sum is σ = 243862981800. Its totient is φ = 201968971776.

The previous prime is 222001021003. The next prime is 222001021027. The reversal of 222001021021 is 120120100222.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 138578252121 + 83422768900 = 372261^2 + 288830^2 .

It is not a de Polignac number, because 222001021021 - 2¹⁷ = 222000889949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222001020992 and 222001021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001021027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19104205 + ... + 19115821.

It is an arithmetic number, because the mean of its divisors is an integer number (10160957575).

Almost surely, 2^222001021021 is an apocalyptic number.

It is an amenable number.

222001021021 is a deficient number, since it is larger than the sum of its proper divisors (21861960779).

222001021021 is a wasteful number, since it uses less digits than its factorization.

222001021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265 (or 13252 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 222001021021 its reverse (120120100222), we get a palindrome (342121121243).

The spelling of 222001021021 in words is "two hundred twenty-two billion, one million, twenty-one thousand, twenty-one".