221278737841 has 12 divisors (see below), whose sum is σ = 257465124912. Its totient is φ = 189623834568.

The previous prime is 221278737749. The next prime is 221278737863. The reversal of 221278737841 is 148737872122.

It is not a de Polignac number, because 221278737841 - 2¹⁹ = 221278213553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221278737041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303735 + ... + 731308.

It is an arithmetic number, because the mean of its divisors is an integer number (21455427076).

Almost surely, 2^221278737841 is an apocalyptic number.

It is an amenable number.

221278737841 is a deficient number, since it is larger than the sum of its proper divisors (36186387071).

221278737841 is a wasteful number, since it uses less digits than its factorization.

221278737841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039420 (or 1039413 counting only the distinct ones).

The product of its digits is 2107392, while the sum is 52.

The spelling of 221278737841 in words is "two hundred twenty-one billion, two hundred seventy-eight million, seven hundred thirty-seven thousand, eight hundred forty-one".