21220122101 has 2 divisors, whose sum is σ = 21220122102. Its totient is φ = 21220122100.

The previous prime is 21220122047. The next prime is 21220122107. The reversal of 21220122101 is 10122102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19907799025 + 1312323076 = 141095^2 + 36226^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220122101 - 2²⁶ = 21153013237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220122107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610061050 + 10610061051.

It is an arithmetic number, because the mean of its divisors is an integer number (10610061051).

Almost surely, 2^21220122101 is an apocalyptic number.

It is an amenable number.

21220122101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220122101 is an equidigital number, since it uses as much as digits as its factorization.

21220122101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220122101 its reverse (10122102212), we get a palindrome (31342224313).

The spelling of 21220122101 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, one hundred one".