21400240319 has 2 divisors, whose sum is σ = 21400240320. Its totient is φ = 21400240318.

The previous prime is 21400240297. The next prime is 21400240331. The reversal of 21400240319 is 91304200412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21400240319 - 2¹² = 21400236223 is a prime.

It is a super-2 number, since 2×21400240319² (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 (21400240349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700120159 + 10700120160.

It is an arithmetic number, because the mean of its divisors is an integer number (10700120160).

Almost surely, 2^21400240319 is an apocalyptic number.

21400240319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21400240319 is an equidigital number, since it uses as much as digits as its factorization.

21400240319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21400240319 in words is "twenty-one billion, four hundred million, two hundred forty thousand, three hundred nineteen".