101221120643 has 2 divisors, whose sum is σ = 101221120644. Its totient is φ = 101221120642.

The previous prime is 101221120621. The next prime is 101221120667. The reversal of 101221120643 is 346021122101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101221120643 - 2⁸ = 101221120387 is a prime.

It is not a weakly prime, because it can be changed into another prime (101221120043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610560321 + 50610560322.

It is an arithmetic number, because the mean of its divisors is an integer number (50610560322).

Almost surely, 2^101221120643 is an apocalyptic number.

101221120643 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221120643 is an equidigital number, since it uses as much as digits as its factorization.

101221120643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 101221120643 its reverse (346021122101), we get a palindrome (447242242744).

The spelling of 101221120643 in words is "one hundred one billion, two hundred twenty-one million, one hundred twenty thousand, six hundred forty-three".