221110997 has 2 divisors, whose sum is σ = 221110998. Its totient is φ = 221110996.

The previous prime is 221110973. The next prime is 221111021. The reversal of 221110997 is 799011122.

It is a balanced prime because it is at equal distance from previous prime (221110973) and next prime (221111021).

It can be written as a sum of positive squares in only one way, i.e., 220403716 + 707281 = 14846^2 + 841^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110997 - 2⁶ = 221110933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221110907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555498 + 110555499.

It is an arithmetic number, because the mean of its divisors is an integer number (110555499).

Almost surely, 2^221110997 is an apocalyptic number.

It is an amenable number.

221110997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110997 is an equidigital number, since it uses as much as digits as its factorization.

221110997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 221110997 is about 14869.8015117889. The cubic root of 221110997 is about 604.6955616047.

The spelling of 221110997 in words is "two hundred twenty-one million, one hundred ten thousand, nine hundred ninety-seven".