21761130851 has 2 divisors, whose sum is σ = 21761130852. Its totient is φ = 21761130850.

The previous prime is 21761130779. The next prime is 21761130869. The reversal of 21761130851 is 15803116712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21761130851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21761130151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10880565425 + 10880565426.

It is an arithmetic number, because the mean of its divisors is an integer number (10880565426).

Almost surely, 2^21761130851 is an apocalyptic number.

21761130851 is a deficient number, since it is larger than the sum of its proper divisors (1).

21761130851 is an equidigital number, since it uses as much as digits as its factorization.

21761130851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 21761130851 in words is "twenty-one billion, seven hundred sixty-one million, one hundred thirty thousand, eight hundred fifty-one".