221421226332569 has 4 divisors (see below), whose sum is σ = 221421277099620. Its totient is φ = 221421175565520.

The previous prime is 221421226332547. The next prime is 221421226332611. The reversal of 221421226332569 is 965233622124122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147955962601225 + 73465263731344 = 12163715^2 + 8571188^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421226332569 - 2¹² = 221421226328473 is a prime.

It is a super-2 number, since 2×221421226332569² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421226332869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18155114 + ... + 27792995.

It is an arithmetic number, because the mean of its divisors is an integer number (55355319274905).

Almost surely, 2^{221421226332569} is an apocalyptic number.

It is an amenable number.

221421226332569 is a deficient number, since it is larger than the sum of its proper divisors (50767051).

221421226332569 is an equidigital number, since it uses as much as digits as its factorization.

221421226332569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50767050.

The product of its digits is 3732480, while the sum is 50.

The spelling of 221421226332569 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred twenty-six million, three hundred thirty-two thousand, five hundred sixty-nine".