21251100420233 has 2 divisors, whose sum is σ = 21251100420234. Its totient is φ = 21251100420232.

The previous prime is 21251100420223. The next prime is 21251100420257. The reversal of 21251100420233 is 33202400115212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12737496895369 + 8513603524864 = 3568963^2 + 2917808^2 .

It is a cyclic number.

It is not a de Polignac number, because 21251100420233 - 2⁸ = 21251100419977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21251100420223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625550210116 + 10625550210117.

It is an arithmetic number, because the mean of its divisors is an integer number (10625550210117).

Almost surely, 2^{21251100420233} is an apocalyptic number.

It is an amenable number.

21251100420233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21251100420233 is an equidigital number, since it uses as much as digits as its factorization.

21251100420233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21251100420233 its reverse (33202400115212), we get a palindrome (54453500535445).

The spelling of 21251100420233 in words is "twenty-one trillion, two hundred fifty-one billion, one hundred million, four hundred twenty thousand, two hundred thirty-three".