21275202029 has 2 divisors, whose sum is σ = 21275202030. Its totient is φ = 21275202028.

The previous prime is 21275202019. The next prime is 21275202073. The reversal of 21275202029 is 92020257212.

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., 21260556100 + 14645929 = 145810^2 + 3827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21275202029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21275201986 and 21275202004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21275202019) 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, 10637601014 + 10637601015.

It is an arithmetic number, because the mean of its divisors is an integer number (10637601015).

Almost surely, 2^21275202029 is an apocalyptic number.

It is an amenable number.

21275202029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21275202029 is an equidigital number, since it uses as much as digits as its factorization.

21275202029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21275202029 in words is "twenty-one billion, two hundred seventy-five million, two hundred two thousand, twenty-nine".