221010949 has 2 divisors, whose sum is σ = 221010950. Its totient is φ = 221010948.

The previous prime is 221010929. The next prime is 221010971. The reversal of 221010949 is 949010122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217562500 + 3448449 = 14750^2 + 1857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221010919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505474 + 110505475.

It is an arithmetic number, because the mean of its divisors is an integer number (110505475).

Almost surely, 2^221010949 is an apocalyptic number.

It is an amenable number.

221010949 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010949 is an equidigital number, since it uses as much as digits as its factorization.

221010949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 221010949 is about 14866.4369974786. The cubic root of 221010949 is about 604.6043439064.

The spelling of 221010949 in words is "two hundred twenty-one million, ten thousand, nine hundred forty-nine".