1221100063 has 2 divisors, whose sum is σ = 1221100064. Its totient is φ = 1221100062.

The previous prime is 1221100033. The next prime is 1221100121. The reversal of 1221100063 is 3600011221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221100063 - 2²⁹ = 684229151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221100033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550031 + 610550032.

It is an arithmetic number, because the mean of its divisors is an integer number (610550032).

Almost surely, 2^1221100063 is an apocalyptic number.

1221100063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221100063 is an equidigital number, since it uses as much as digits as its factorization.

1221100063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221100063 is about 34944.2422009692. The cubic root of 1221100063 is about 1068.8507948756.

Adding to 1221100063 its reverse (3600011221), we get a palindrome (4821111284).

The spelling of 1221100063 in words is "one billion, two hundred twenty-one million, one hundred thousand, sixty-three".