222001021 has 16 divisors (see below), whose sum is σ = 247091328. Its totient is φ = 197755200.

The previous prime is 222001009. The next prime is 222001027. The reversal of 222001021 is 120100222.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222000989 and 222001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249840 + ... + 250726.

It is an arithmetic number, because the mean of its divisors is an integer number (15443208).

Almost surely, 2^222001021 is an apocalyptic number.

It is an amenable number.

222001021 is a deficient number, since it is larger than the sum of its proper divisors (25090307).

222001021 is a wasteful number, since it uses less digits than its factorization.

222001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 222001021 is about 14899.6986882286. The cubic root of 222001021 is about 605.5058229087.

Adding to 222001021 its reverse (120100222), we get a palindrome (342101243).

The spelling of 222001021 in words is "two hundred twenty-two million, one thousand, twenty-one".