21022221107 has 2 divisors, whose sum is σ = 21022221108. Its totient is φ = 21022221106.

The previous prime is 21022221079. The next prime is 21022221163. The reversal of 21022221107 is 70112222012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022221107 - 2¹⁰ = 21022220083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022221907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511110553 + 10511110554.

It is an arithmetic number, because the mean of its divisors is an integer number (10511110554).

Almost surely, 2^21022221107 is an apocalyptic number.

21022221107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022221107 is an equidigital number, since it uses as much as digits as its factorization.

21022221107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21022221107 its reverse (70112222012), we get a palindrome (91134443119).

The spelling of 21022221107 in words is "twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred seven".