21254310733 has 2 divisors, whose sum is σ = 21254310734. Its totient is φ = 21254310732.

The previous prime is 21254310683. The next prime is 21254310817. The reversal of 21254310733 is 33701345212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21086815369 + 167495364 = 145213^2 + 12942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254310733 - 2³³ = 12664376141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21254310695 and 21254310704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21254310433) 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, 10627155366 + 10627155367.

It is an arithmetic number, because the mean of its divisors is an integer number (10627155367).

Almost surely, 2^21254310733 is an apocalyptic number.

It is an amenable number.

21254310733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254310733 is an equidigital number, since it uses as much as digits as its factorization.

21254310733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 31.

Adding to 21254310733 its reverse (33701345212), we get a palindrome (54955655945).

The spelling of 21254310733 in words is "twenty-one billion, two hundred fifty-four million, three hundred ten thousand, seven hundred thirty-three".