21203276753 has 2 divisors, whose sum is σ = 21203276754. Its totient is φ = 21203276752.

The previous prime is 21203276749. The next prime is 21203276797. The reversal of 21203276753 is 35767230212.

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., 10893514384 + 10309762369 = 104372^2 + 101537^2 .

It is a cyclic number.

It is not a de Polignac number, because 21203276753 - 2² = 21203276749 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203276723) 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, 10601638376 + 10601638377.

It is an arithmetic number, because the mean of its divisors is an integer number (10601638377).

Almost surely, 2^21203276753 is an apocalyptic number.

It is an amenable number.

21203276753 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203276753 is an equidigital number, since it uses as much as digits as its factorization.

21203276753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 38.

The spelling of 21203276753 in words is "twenty-one billion, two hundred three million, two hundred seventy-six thousand, seven hundred fifty-three".