221073997 has 2 divisors, whose sum is σ = 221073998. Its totient is φ = 221073996.

The previous prime is 221073959. The next prime is 221074031. The reversal of 221073997 is 799370122.

221073997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220849321 + 224676 = 14861^2 + 474^2 .

It is a cyclic number.

It is not a de Polignac number, because 221073997 - 2¹⁵ = 221041229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221073497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110536998 + 110536999.

It is an arithmetic number, because the mean of its divisors is an integer number (110536999).

Almost surely, 2^221073997 is an apocalyptic number.

It is an amenable number.

221073997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221073997 is an equidigital number, since it uses as much as digits as its factorization.

221073997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 221073997 is about 14868.5573274612. The cubic root of 221073997 is about 604.6618304558.

The spelling of 221073997 in words is "two hundred twenty-one million, seventy-three thousand, nine hundred ninety-seven".