21603426283 has 2 divisors, whose sum is σ = 21603426284. Its totient is φ = 21603426282.

The previous prime is 21603426211. The next prime is 21603426337. The reversal of 21603426283 is 38262430612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21603426283 - 2¹⁷ = 21603295211 is a prime.

It is not a weakly prime, because it can be changed into another prime (21603406283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801713141 + 10801713142.

It is an arithmetic number, because the mean of its divisors is an integer number (10801713142).

Almost surely, 2^21603426283 is an apocalyptic number.

21603426283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21603426283 is an equidigital number, since it uses as much as digits as its factorization.

21603426283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 37.

Adding to 21603426283 its reverse (38262430612), we get a palindrome (59865856895).

The spelling of 21603426283 in words is "twenty-one billion, six hundred three million, four hundred twenty-six thousand, two hundred eighty-three".