21022222129 has 2 divisors, whose sum is σ = 21022222130. Its totient is φ = 21022222128.

The previous prime is 21022222033. The next prime is 21022222159. The reversal of 21022222129 is 92122222012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18185061904 + 2837160225 = 134852^2 + 53265^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022222129 - 2¹¹ = 21022220081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21022222159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511111064 + 10511111065.

It is an arithmetic number, because the mean of its divisors is an integer number (10511111065).

Almost surely, 2^21022222129 is an apocalyptic number.

It is an amenable number.

21022222129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022222129 is an equidigital number, since it uses as much as digits as its factorization.

21022222129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 21022222129 in words is "twenty-one billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty-nine".