223955621 has 2 divisors, whose sum is σ = 223955622. Its totient is φ = 223955620.

The previous prime is 223955609. The next prime is 223955647. The reversal of 223955621 is 126559322.

223955621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199204996 + 24750625 = 14114^2 + 4975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223955621 is a prime.

It is a super-2 number, since 2×223955621² = 100312240354991282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223955321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111977810 + 111977811.

It is an arithmetic number, because the mean of its divisors is an integer number (111977811).

Almost surely, 2^223955621 is an apocalyptic number.

It is an amenable number.

223955621 is a deficient number, since it is larger than the sum of its proper divisors (1).

223955621 is an equidigital number, since it uses as much as digits as its factorization.

223955621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 223955621 is about 14965.1468753233. The cubic root of 223955621 is about 607.2776843506.

The spelling of 223955621 in words is "two hundred twenty-three million, nine hundred fifty-five thousand, six hundred twenty-one".