21243076957433 has 2 divisors, whose sum is σ = 21243076957434. Its totient is φ = 21243076957432.

The previous prime is 21243076957387. The next prime is 21243076957481. The reversal of 21243076957433 is 33475967034212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19925751485929 + 1317325471504 = 4463827^2 + 1147748^2 .

It is a cyclic number.

It is not a de Polignac number, because 21243076957433 - 2²⁶ = 21243009848569 is a prime.

It is a super-4 number, since 4×21243076957433⁴ (a number of 54 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21243076957493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621538478716 + 10621538478717.

It is an arithmetic number, because the mean of its divisors is an integer number (10621538478717).

Almost surely, 2^{21243076957433} is an apocalyptic number.

It is an amenable number.

21243076957433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243076957433 is an equidigital number, since it uses as much as digits as its factorization.

21243076957433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 56.

The spelling of 21243076957433 in words is "twenty-one trillion, two hundred forty-three billion, seventy-six million, nine hundred fifty-seven thousand, four hundred thirty-three".