221422644370549 has 2 divisors, whose sum is σ = 221422644370550. Its totient is φ = 221422644370548.

The previous prime is 221422644370511. The next prime is 221422644370559. The reversal of 221422644370549 is 945073446224122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122691732156900 + 98730912213649 = 11076630^2 + 9936343^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422644370549 - 2⁴⁷ = 80685156015221 is a prime.

It is a super-2 number, since 2×221422644370549² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221422644370549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221422644370559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711322185274 + 110711322185275.

It is an arithmetic number, because the mean of its divisors is an integer number (110711322185275).

Almost surely, 2^{221422644370549} is an apocalyptic number.

It is an amenable number.

221422644370549 is a deficient number, since it is larger than the sum of its proper divisors (1).

221422644370549 is an equidigital number, since it uses as much as digits as its factorization.

221422644370549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 55.

The spelling of 221422644370549 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, six hundred forty-four million, three hundred seventy thousand, five hundred forty-nine".