21220122029 has 2 divisors, whose sum is σ = 21220122030. Its totient is φ = 21220122028.

The previous prime is 21220121971. The next prime is 21220122047. The reversal of 21220122029 is 92022102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16025028100 + 5195093929 = 126590^2 + 72077^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220122029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21220121995 and 21220122013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220122829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610061014 + 10610061015.

It is an arithmetic number, because the mean of its divisors is an integer number (10610061015).

Almost surely, 2^21220122029 is an apocalyptic number.

It is an amenable number.

21220122029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220122029 is an equidigital number, since it uses as much as digits as its factorization.

21220122029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21220122029 in words is "twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, twenty-nine".