1221201001963 has 2 divisors, whose sum is σ = 1221201001964. Its totient is φ = 1221201001962.

The previous prime is 1221201001939. The next prime is 1221201002011. The reversal of 1221201001963 is 3691001021221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221201001963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221201001913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600500981 + 610600500982.

It is an arithmetic number, because the mean of its divisors is an integer number (610600500982).

Almost surely, 2^{1221201001963} is an apocalyptic number.

1221201001963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221201001963 is an equidigital number, since it uses as much as digits as its factorization.

1221201001963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 1221201001963 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one thousand, nine hundred sixty-three".