221738041801 has 4 divisors (see below), whose sum is σ = 221766760912. Its totient is φ = 221709322692.

The previous prime is 221738041793. The next prime is 221738041853. The reversal of 221738041801 is 108140837122.

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.

It is a cyclic number.

It is not a de Polignac number, because 221738041801 - 2³ = 221738041793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221738041901) 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, 14347971 + ... + 14363416.

It is an arithmetic number, because the mean of its divisors is an integer number (55441690228).

Almost surely, 2^221738041801 is an apocalyptic number.

It is an amenable number.

221738041801 is a deficient number, since it is larger than the sum of its proper divisors (28719111).

221738041801 is an equidigital number, since it uses as much as digits as its factorization.

221738041801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28719110.

The product of its (nonzero) digits is 21504, while the sum is 37.

Adding to 221738041801 its reverse (108140837122), we get a palindrome (329878878923).

The spelling of 221738041801 in words is "two hundred twenty-one billion, seven hundred thirty-eight million, forty-one thousand, eight hundred one".