221001221020969 has 2 divisors, whose sum is σ = 221001221020970. Its totient is φ = 221001221020968.

The previous prime is 221001221020967. The next prime is 221001221021029. The reversal of 221001221020969 is 969020122100122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208771057983744 + 12230163037225 = 14448912^2 + 3497165^2 .

It is a cyclic number.

It is not a de Polignac number, because 221001221020969 - 2¹ = 221001221020967 is a prime.

It is a super-2 number, since 2×221001221020969² (a number of 29 digits) contains 22 as substring.

Together with 221001221020967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221001221020967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500610510484 + 110500610510485.

It is an arithmetic number, because the mean of its divisors is an integer number (110500610510485).

Almost surely, 2^{221001221020969} is an apocalyptic number.

It is an amenable number.

221001221020969 is a deficient number, since it is larger than the sum of its proper divisors (1).

221001221020969 is an equidigital number, since it uses as much as digits as its factorization.

221001221020969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 221001221020969 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, twenty thousand, nine hundred sixty-nine".