21232200251 has 2 divisors, whose sum is σ = 21232200252. Its totient is φ = 21232200250.

The previous prime is 21232200247. The next prime is 21232200293. The reversal of 21232200251 is 15200223212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232200251 - 2² = 21232200247 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232200851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616100125 + 10616100126.

It is an arithmetic number, because the mean of its divisors is an integer number (10616100126).

Almost surely, 2^21232200251 is an apocalyptic number.

21232200251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232200251 is an equidigital number, since it uses as much as digits as its factorization.

21232200251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21232200251 its reverse (15200223212), we get a palindrome (36432423463).

The spelling of 21232200251 in words is "twenty-one billion, two hundred thirty-two million, two hundred thousand, two hundred fifty-one".