221745961733 has 16 divisors (see below), whose sum is σ = 237802350720. Its totient is φ = 206267269824.

The previous prime is 221745961721. The next prime is 221745961781. The reversal of 221745961733 is 337169547122.

It is a cyclic number.

It is not a de Polignac number, because 221745961733 - 2³⁰ = 220672219909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221745961933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263066 + ... + 716027.

It is an arithmetic number, because the mean of its divisors is an integer number (14862646920).

Almost surely, 2^221745961733 is an apocalyptic number.

221745961733 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221745961733 is a deficient number, since it is larger than the sum of its proper divisors (16056388987).

221745961733 is a wasteful number, since it uses less digits than its factorization.

221745961733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979388.

The product of its digits is 1905120, while the sum is 50.

The spelling of 221745961733 in words is "two hundred twenty-one billion, seven hundred forty-five million, nine hundred sixty-one thousand, seven hundred thirty-three".