1221101963 has 2 divisors, whose sum is σ = 1221101964. Its totient is φ = 1221101962.

The previous prime is 1221101953. The next prime is 1221102007. The reversal of 1221101963 is 3691011221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221101963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221101923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610550981 + 610550982.

It is an arithmetic number, because the mean of its divisors is an integer number (610550982).

Almost surely, 2^1221101963 is an apocalyptic number.

1221101963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221101963 is an equidigital number, since it uses as much as digits as its factorization.

1221101963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 1221101963 is about 34944.2693871256. The cubic root of 1221101963 is about 1068.8513492434.

The spelling of 1221101963 in words is "one billion, two hundred twenty-one million, one hundred one thousand, nine hundred sixty-three".