20234355221 has 2 divisors, whose sum is σ = 20234355222. Its totient is φ = 20234355220.

The previous prime is 20234355217. The next prime is 20234355257. The reversal of 20234355221 is 12255343202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20131636996 + 102718225 = 141886^2 + 10135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20234355221 - 2² = 20234355217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20234375221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117177610 + 10117177611.

It is an arithmetic number, because the mean of its divisors is an integer number (10117177611).

Almost surely, 2^20234355221 is an apocalyptic number.

It is an amenable number.

20234355221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20234355221 is an equidigital number, since it uses as much as digits as its factorization.

20234355221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20234355221 its reverse (12255343202), we get a palindrome (32489698423).

The spelling of 20234355221 in words is "twenty billion, two hundred thirty-four million, three hundred fifty-five thousand, two hundred twenty-one".