21112211201057 has 2 divisors, whose sum is σ = 21112211201058. Its totient is φ = 21112211201056.

The previous prime is 21112211201021. The next prime is 21112211201117. The reversal of 21112211201057 is 75010211221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21092856548416 + 19354652641 = 4592696^2 + 139121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112211201057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112210201057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105600528 + 10556105600529.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105600529).

Almost surely, 2^{21112211201057} is an apocalyptic number.

It is an amenable number.

21112211201057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112211201057 is an equidigital number, since it uses as much as digits as its factorization.

21112211201057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 26.

Adding to 21112211201057 its reverse (75010211221112), we get a palindrome (96122422422169).

The spelling of 21112211201057 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, two hundred one thousand, fifty-seven".