221221997963 has 2 divisors, whose sum is σ = 221221997964. Its totient is φ = 221221997962.

The previous prime is 221221997947. The next prime is 221221997981. The reversal of 221221997963 is 369799122122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221221997963 - 2⁴ = 221221997947 is a prime.

It is a super-2 number, since 2×221221997963² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221221997063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610998981 + 110610998982.

It is an arithmetic number, because the mean of its divisors is an integer number (110610998982).

Almost surely, 2^221221997963 is an apocalyptic number.

221221997963 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221997963 is an equidigital number, since it uses as much as digits as its factorization.

221221997963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1469664, while the sum is 53.

The spelling of 221221997963 in words is "two hundred twenty-one billion, two hundred twenty-one million, nine hundred ninety-seven thousand, nine hundred sixty-three".