21275202073 has 2 divisors, whose sum is σ = 21275202074. Its totient is φ = 21275202072.

The previous prime is 21275202029. The next prime is 21275202083. The reversal of 21275202073 is 37020257212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17558105049 + 3717097024 = 132507^2 + 60968^2 .

It is a cyclic number.

It is not a de Polignac number, because 21275202073 - 2³³ = 12685267481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21275202083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637601036 + 10637601037.

It is an arithmetic number, because the mean of its divisors is an integer number (10637601037).

Almost surely, 2^21275202073 is an apocalyptic number.

It is an amenable number.

21275202073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21275202073 is an equidigital number, since it uses as much as digits as its factorization.

21275202073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 31.

Adding to 21275202073 its reverse (37020257212), we get a palindrome (58295459285).

The spelling of 21275202073 in words is "twenty-one billion, two hundred seventy-five million, two hundred two thousand, seventy-three".