21234201043277 has 2 divisors, whose sum is σ = 21234201043278. Its totient is φ = 21234201043276.

The previous prime is 21234201043261. The next prime is 21234201043333. The reversal of 21234201043277 is 77234010243212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21216534911881 + 17666131396 = 4606141^2 + 132914^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234201043277 - 2⁴ = 21234201043261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234201043277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234201043177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617100521638 + 10617100521639.

It is an arithmetic number, because the mean of its divisors is an integer number (10617100521639).

Almost surely, 2^{21234201043277} is an apocalyptic number.

It is an amenable number.

21234201043277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234201043277 is an equidigital number, since it uses as much as digits as its factorization.

21234201043277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 38.

Adding to 21234201043277 its reverse (77234010243212), we get a palindrome (98468211286489).

The spelling of 21234201043277 in words is "twenty-one trillion, two hundred thirty-four billion, two hundred one million, forty-three thousand, two hundred seventy-seven".