23212454400221 has 2 divisors, whose sum is σ = 23212454400222. Its totient is φ = 23212454400220.

The previous prime is 23212454400211. The next prime is 23212454400287. The reversal of 23212454400221 is 12200445421232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19455253677721 + 3757200722500 = 4410811^2 + 1938350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23212454400221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212454400211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606227200110 + 11606227200111.

It is an arithmetic number, because the mean of its divisors is an integer number (11606227200111).

Almost surely, 2^{23212454400221} is an apocalyptic number.

It is an amenable number.

23212454400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212454400221 is an equidigital number, since it uses as much as digits as its factorization.

23212454400221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 23212454400221 its reverse (12200445421232), we get a palindrome (35412899821453).

The spelling of 23212454400221 in words is "twenty-three trillion, two hundred twelve billion, four hundred fifty-four million, four hundred thousand, two hundred twenty-one".