222010021 has 8 divisors (see below), whose sum is σ = 235540440. Its totient is φ = 208531968.

The previous prime is 222010013. The next prime is 222010043. The reversal of 222010021 is 120010222.

It can be written as a sum of positive squares in 4 ways, for example, as 72437121 + 149572900 = 8511^2 + 12230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 222010021 - 2³ = 222010013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222010081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4176 + ... + 21481.

It is an arithmetic number, because the mean of its divisors is an integer number (29442555).

Almost surely, 2^222010021 is an apocalyptic number.

It is an amenable number.

222010021 is a deficient number, since it is larger than the sum of its proper divisors (13530419).

222010021 is a wasteful number, since it uses less digits than its factorization.

222010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26183.

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

The square root of 222010021 is about 14900.0007046980. Note that the first 3 decimals coincide. The cubic root of 222010021 is about 605.5140052716.

Adding to 222010021 its reverse (120010222), we get a palindrome (342020243).

The spelling of 222010021 in words is "two hundred twenty-two million, ten thousand, twenty-one".