21201733613 has 2 divisors, whose sum is σ = 21201733614. Its totient is φ = 21201733612.

The previous prime is 21201733607. The next prime is 21201733649. The reversal of 21201733613 is 31633710212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21198486409 + 3247204 = 145597^2 + 1802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201733613 - 2¹⁶ = 21201668077 is a prime.

It is a super-2 number, since 2×21201733613² (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 (21201733213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600866806 + 10600866807.

It is an arithmetic number, because the mean of its divisors is an integer number (10600866807).

Almost surely, 2^21201733613 is an apocalyptic number.

It is an amenable number.

21201733613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201733613 is an equidigital number, since it uses as much as digits as its factorization.

21201733613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The spelling of 21201733613 in words is "twenty-one billion, two hundred one million, seven hundred thirty-three thousand, six hundred thirteen".