221939838745 has 4 divisors (see below), whose sum is σ = 266327806500. Its totient is φ = 177551870992.

The previous prime is 221939838737. The next prime is 221939838767. The reversal of 221939838745 is 547838939122.

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 33128732169 + 188811106576 = 182013^2 + 434524^2 .

It is a cyclic number.

It is not a de Polignac number, because 221939838745 - 2³ = 221939838737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22193983870 + ... + 22193983879.

It is an arithmetic number, because the mean of its divisors is an integer number (66581951625).

Almost surely, 2^221939838745 is an apocalyptic number.

It is an amenable number.

221939838745 is a deficient number, since it is larger than the sum of its proper divisors (44387967755).

221939838745 is an equidigital number, since it uses as much as digits as its factorization.

221939838745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44387967754.

The product of its digits is 26127360, while the sum is 61.

The spelling of 221939838745 in words is "two hundred twenty-one billion, nine hundred thirty-nine million, eight hundred thirty-eight thousand, seven hundred forty-five".