21201210053 has 2 divisors, whose sum is σ = 21201210054. Its totient is φ = 21201210052.

The previous prime is 21201210047. The next prime is 21201210083. The reversal of 21201210053 is 35001210212.

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., 20556964129 + 644245924 = 143377^2 + 25382^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201210053 - 2¹² = 21201205957 is a prime.

It is a super-2 number, since 2×21201210053² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21201210083) 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, 10600605026 + 10600605027.

It is an arithmetic number, because the mean of its divisors is an integer number (10600605027).

Almost surely, 2^21201210053 is an apocalyptic number.

It is an amenable number.

21201210053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201210053 is an equidigital number, since it uses as much as digits as its factorization.

21201210053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 21201210053 its reverse (35001210212), we get a palindrome (56202420265).

The spelling of 21201210053 in words is "twenty-one billion, two hundred one million, two hundred ten thousand, fifty-three".