21342403787 has 2 divisors, whose sum is σ = 21342403788. Its totient is φ = 21342403786.

The previous prime is 21342403781. The next prime is 21342403793. The reversal of 21342403787 is 78730424312.

It is a balanced prime because it is at equal distance from previous prime (21342403781) and next prime (21342403793).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21342403787 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342403781) 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, 10671201893 + 10671201894.

It is an arithmetic number, because the mean of its divisors is an integer number (10671201894).

Almost surely, 2^21342403787 is an apocalyptic number.

21342403787 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342403787 is an equidigital number, since it uses as much as digits as its factorization.

21342403787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 21342403787 in words is "twenty-one billion, three hundred forty-two million, four hundred three thousand, seven hundred eighty-seven".