221001221087 has 2 divisors, whose sum is σ = 221001221088. Its totient is φ = 221001221086.

The previous prime is 221001221041. The next prime is 221001221099. The reversal of 221001221087 is 780122100122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221001221087 - 2³² = 216706253791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221001251087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500610543 + 110500610544.

It is an arithmetic number, because the mean of its divisors is an integer number (110500610544).

Almost surely, 2^221001221087 is an apocalyptic number.

221001221087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001221087 is an equidigital number, since it uses as much as digits as its factorization.

221001221087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The spelling of 221001221087 in words is "two hundred twenty-one billion, one million, two hundred twenty-one thousand, eighty-seven".