21000110222101 has 2 divisors, whose sum is σ = 21000110222102. Its totient is φ = 21000110222100.

The previous prime is 21000110222071. The next prime is 21000110222123. The reversal of 21000110222101 is 10122201100012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11338742963025 + 9661367259076 = 3367305^2 + 3108274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000110222101 - 2⁷ = 21000110221973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000110222141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500055111050 + 10500055111051.

It is an arithmetic number, because the mean of its divisors is an integer number (10500055111051).

Almost surely, 2^{21000110222101} is an apocalyptic number.

It is an amenable number.

21000110222101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000110222101 is an equidigital number, since it uses as much as digits as its factorization.

21000110222101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000110222101 its reverse (10122201100012), we get a palindrome (31122311322113).

The spelling of 21000110222101 in words is "twenty-one trillion, one hundred ten million, two hundred twenty-two thousand, one hundred one".