222647021 has 8 divisors (see below), whose sum is σ = 224382744. Its totient is φ = 220916800.

The previous prime is 222646999. The next prime is 222647027. The reversal of 222647021 is 120746222.

It can be written as a sum of positive squares in 4 ways, for example, as 101404900 + 121242121 = 10070^2 + 11011^2 .

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 222647021 - 2¹⁴ = 222630637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222647027) 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, 116171 + ... + 118071.

It is an arithmetic number, because the mean of its divisors is an integer number (28047843).

Almost surely, 2^222647021 is an apocalyptic number.

It is an amenable number.

222647021 is a deficient number, since it is larger than the sum of its proper divisors (1735723).

222647021 is a wasteful number, since it uses less digits than its factorization.

222647021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 222647021 is about 14921.3612314695. The cubic root of 222647021 is about 606.0925739117.

It can be divided in two parts, 2226 and 47021, that multiplied together give a triangular number (104668746 = T₁₄₄₆₈).

The spelling of 222647021 in words is "two hundred twenty-two million, six hundred forty-seven thousand, twenty-one".