222824821 has 2 divisors, whose sum is σ = 222824822. Its totient is φ = 222824820.

The previous prime is 222824801. The next prime is 222824857. The reversal of 222824821 is 128428222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188073796 + 34751025 = 13714^2 + 5895^2 .

It is a cyclic number.

It is not a de Polignac number, because 222824821 - 2¹⁷ = 222693749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222824801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111412410 + 111412411.

It is an arithmetic number, because the mean of its divisors is an integer number (111412411).

Almost surely, 2^222824821 is an apocalyptic number.

It is an amenable number.

222824821 is a deficient number, since it is larger than the sum of its proper divisors (1).

222824821 is an equidigital number, since it uses as much as digits as its factorization.

222824821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8192, while the sum is 31.

The square root of 222824821 is about 14927.3179439576. The cubic root of 222824821 is about 606.2538674639.

The spelling of 222824821 in words is "two hundred twenty-two million, eight hundred twenty-four thousand, eight hundred twenty-one".