222001001021 has 4 divisors (see below), whose sum is σ = 235059883452. Its totient is φ = 208942118592.

The previous prime is 222001001017. The next prime is 222001001069. The reversal of 222001001021 is 120100100222.

It is a happy number.

222001001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71775768100 + 150225232921 = 267910^2 + 387589^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001001021 - 2² = 222001001017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222001000993 and 222001001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6529441190 + ... + 6529441223.

It is an arithmetic number, because the mean of its divisors is an integer number (58764970863).

Almost surely, 2^222001001021 is an apocalyptic number.

It is an amenable number.

222001001021 is a deficient number, since it is larger than the sum of its proper divisors (13058882431).

222001001021 is a wasteful number, since it uses less digits than its factorization.

222001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13058882430.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 222001001021 its reverse (120100100222), we get a palindrome (342101101243).

The spelling of 222001001021 in words is "two hundred twenty-two billion, one million, one thousand, twenty-one".