221736425441 has 4 divisors (see below), whose sum is σ = 225494670000. Its totient is φ = 217978180884.

The previous prime is 221736425423. The next prime is 221736425527. The reversal of 221736425441 is 144524637122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144524637122 = 2 ⋅72262318561.

It is a cyclic number.

It is not a de Polignac number, because 221736425441 - 2¹⁰ = 221736424417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221736425641) 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, 1879122191 + ... + 1879122308.

It is an arithmetic number, because the mean of its divisors is an integer number (56373667500).

Almost surely, 2^221736425441 is an apocalyptic number.

It is an amenable number.

221736425441 is a deficient number, since it is larger than the sum of its proper divisors (3758244559).

221736425441 is an equidigital number, since it uses as much as digits as its factorization.

221736425441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758244558.

The product of its digits is 322560, while the sum is 41.

The spelling of 221736425441 in words is "two hundred twenty-one billion, seven hundred thirty-six million, four hundred twenty-five thousand, four hundred forty-one".