21022211122201 has 2 divisors, whose sum is σ = 21022211122202. Its totient is φ = 21022211122200.

The previous prime is 21022211122153. The next prime is 21022211122223. The reversal of 21022211122201 is 10222111222012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19167330558601 + 1854880563600 = 4378051^2 + 1361940^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022211122201 - 2²⁹ = 21021674251289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022211122261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511105561100 + 10511105561101.

It is an arithmetic number, because the mean of its divisors is an integer number (10511105561101).

Almost surely, 2^{21022211122201} is an apocalyptic number.

It is an amenable number.

21022211122201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022211122201 is an equidigital number, since it uses as much as digits as its factorization.

21022211122201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21022211122201 its reverse (10222111222012), we get a palindrome (31244322344213).

It can be divided in two parts, 2 and 1022211122201, that multiplied together give a palindrome (2044422244402).

The spelling of 21022211122201 in words is "twenty-one trillion, twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, two hundred one".