21200220220057 has 2 divisors, whose sum is σ = 21200220220058. Its totient is φ = 21200220220056.

The previous prime is 21200220219907. The next prime is 21200220220063. The reversal of 21200220220057 is 75002202200212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20630091025296 + 570129194761 = 4542036^2 + 755069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200220220057 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200220220097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600110110028 + 10600110110029.

It is an arithmetic number, because the mean of its divisors is an integer number (10600110110029).

Almost surely, 2^{21200220220057} is an apocalyptic number.

It is an amenable number.

21200220220057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200220220057 is an equidigital number, since it uses as much as digits as its factorization.

21200220220057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

Adding to 21200220220057 its reverse (75002202200212), we get a palindrome (96202422420269).

The spelling of 21200220220057 in words is "twenty-one trillion, two hundred billion, two hundred twenty million, two hundred twenty thousand, fifty-seven".