221422056536437 has 4 divisors (see below), whose sum is σ = 221795449549740. Its totient is φ = 221048663523136.

The previous prime is 221422056536431. The next prime is 221422056536537. The reversal of 221422056536437 is 734635650224122.

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 138722202685521 + 82699853850916 = 11778039^2 + 9093946^2 .

It is a cyclic number.

It is not a de Polignac number, because 221422056536437 - 2¹⁹ = 221422056012149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422056536431) 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, 186696505762 + ... + 186696506947.

It is an arithmetic number, because the mean of its divisors is an integer number (55448862387435).

Almost surely, 2^{221422056536437} is an apocalyptic number.

It is an amenable number.

221422056536437 is a deficient number, since it is larger than the sum of its proper divisors (373393013303).

221422056536437 is an equidigital number, since it uses as much as digits as its factorization.

221422056536437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373393013302.

The product of its (nonzero) digits is 14515200, while the sum is 52.

The spelling of 221422056536437 in words is "two hundred twenty-one trillion, four hundred twenty-two billion, fifty-six million, five hundred thirty-six thousand, four hundred thirty-seven".