21233019936797 has 2 divisors, whose sum is σ = 21233019936798. Its totient is φ = 21233019936796.

The previous prime is 21233019936749. The next prime is 21233019936809. The reversal of 21233019936797 is 79763991033212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19425121871236 + 1807898065561 = 4407394^2 + 1344581^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233019936797 - 2¹⁰ = 21233019935773 is a prime.

It is a super-2 number, since 2×21233019936797² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233019936497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616509968398 + 10616509968399.

It is an arithmetic number, because the mean of its divisors is an integer number (10616509968399).

Almost surely, 2^{21233019936797} is an apocalyptic number.

It is an amenable number.

21233019936797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233019936797 is an equidigital number, since it uses as much as digits as its factorization.

21233019936797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23147208, while the sum is 62.

The spelling of 21233019936797 in words is "twenty-one trillion, two hundred thirty-three billion, nineteen million, nine hundred thirty-six thousand, seven hundred ninety-seven".