221984934893 has 2 divisors, whose sum is σ = 221984934894. Its totient is φ = 221984934892.

The previous prime is 221984934889. The next prime is 221984934917. The reversal of 221984934893 is 398439489122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167197574404 + 54787360489 = 408898^2 + 234067^2 .

It is a cyclic number.

It is not a de Polignac number, because 221984934893 - 2² = 221984934889 is a prime.

It is a super-2 number, since 2×221984934893² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221984934803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110992467446 + 110992467447.

It is an arithmetic number, because the mean of its divisors is an integer number (110992467447).

Almost surely, 2^221984934893 is an apocalyptic number.

It is an amenable number.

221984934893 is a deficient number, since it is larger than the sum of its proper divisors (1).

221984934893 is an equidigital number, since it uses as much as digits as its factorization.

221984934893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26873856, while the sum is 62.

The spelling of 221984934893 in words is "two hundred twenty-one billion, nine hundred eighty-four million, nine hundred thirty-four thousand, eight hundred ninety-three".