21896072851 has 2 divisors, whose sum is σ = 21896072852. Its totient is φ = 21896072850.

The previous prime is 21896072833. The next prime is 21896072857. The reversal of 21896072851 is 15827069812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21896072851 - 2¹⁵ = 21896040083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21896072795 and 21896072804.

It is not a weakly prime, because it can be changed into another prime (21896072857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10948036425 + 10948036426.

It is an arithmetic number, because the mean of its divisors is an integer number (10948036426).

Almost surely, 2^21896072851 is an apocalyptic number.

21896072851 is a deficient number, since it is larger than the sum of its proper divisors (1).

21896072851 is an equidigital number, since it uses as much as digits as its factorization.

21896072851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 21896072851 in words is "twenty-one billion, eight hundred ninety-six million, seventy-two thousand, eight hundred fifty-one".