21220032101 has 2 divisors, whose sum is σ = 21220032102. Its totient is φ = 21220032100.

The previous prime is 21220032091. The next prime is 21220032133. The reversal of 21220032101 is 10123002212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21213631201 + 6400900 = 145649^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220032101 - 2³⁰ = 20146290277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220032401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610016050 + 10610016051.

It is an arithmetic number, because the mean of its divisors is an integer number (10610016051).

Almost surely, 2^21220032101 is an apocalyptic number.

It is an amenable number.

21220032101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220032101 is an equidigital number, since it uses as much as digits as its factorization.

21220032101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21220032101 its reverse (10123002212), we get a palindrome (31343034313).

The spelling of 21220032101 in words is "twenty-one billion, two hundred twenty million, thirty-two thousand, one hundred one".