21202122099953 has 2 divisors, whose sum is σ = 21202122099954. Its totient is φ = 21202122099952.

The previous prime is 21202122099943. The next prime is 21202122100013. The reversal of 21202122099953 is 35999022120212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12403441509904 + 8798680590049 = 3521852^2 + 2966257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202122099953 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 = 21202122099898 and 21202122099907.

It is not a weakly prime, because it can be changed into another prime (21202122099943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601061049976 + 10601061049977.

It is an arithmetic number, because the mean of its divisors is an integer number (10601061049977).

Almost surely, 2^{21202122099953} is an apocalyptic number.

It is an amenable number.

21202122099953 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202122099953 is an equidigital number, since it uses as much as digits as its factorization.

21202122099953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 21202122099953 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-two million, ninety-nine thousand, nine hundred fifty-three".